Precalculus Examples

$w + x - y + z = - 3$ , $- 4 w - x + y - z = 6$ , $- w + 2 x + y + 2 z = 3$

Step 1

Move all terms not containing $w$ to the right side of the equation.

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Step 1.1

Subtract $x$ from both sides of the equation.

$w - y + z = - 3 - x$

$- 4 w - x + y - z = 6$

$- w + 2 x + y + 2 z = 3$

Step 1.2

Add $y$ to both sides of the equation.

$w + z = - 3 - x + y$

$- 4 w - x + y - z = 6$

$- w + 2 x + y + 2 z = 3$

Step 1.3

Subtract $z$ from both sides of the equation.

$w = - 3 - x + y - z$

$- 4 w - x + y - z = 6$

$- w + 2 x + y + 2 z = 3$

$w = - 3 - x + y - z$

$- 4 w - x + y - z = 6$

$- w + 2 x + y + 2 z = 3$

Step 2

Solve the equation for $x$ .

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Step 2.1

Simplify $- 4 (- 3 - x + y - z) - x + y - z$ .

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Step 2.1.1

Simplify each term.

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Step 2.1.1.1

Apply the distributive property.

$- 4 \cdot - 3 - 4 (- x) - 4 y - 4 (- z) - x + y - z = 6$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.1.1.2

Simplify.

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Step 2.1.1.2.1

Multiply $- 4$ by $- 3$ .

$12 - 4 (- x) - 4 y - 4 (- z) - x + y - z = 6$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.1.1.2.2

Multiply $- 1$ by $- 4$ .

$12 + 4 x - 4 y - 4 (- z) - x + y - z = 6$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.1.1.2.3

Multiply $- 1$ by $- 4$ .

$12 + 4 x - 4 y + 4 z - x + y - z = 6$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$12 + 4 x - 4 y + 4 z - x + y - z = 6$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$12 + 4 x - 4 y + 4 z - x + y - z = 6$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.1.2

Simplify by adding terms.

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Step 2.1.2.1

Subtract $x$ from $4 x$ .

$12 + 3 x - 4 y + 4 z + y - z = 6$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.1.2.2

Add $- 4 y$ and $y$ .

$12 + 3 x - 3 y + 4 z - z = 6$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.1.2.3

Subtract $z$ from $4 z$ .

$12 + 3 x - 3 y + 3 z = 6$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$12 + 3 x - 3 y + 3 z = 6$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$12 + 3 x - 3 y + 3 z = 6$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.2

Move all terms not containing $x$ to the right side of the equation.

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Step 2.2.1

Subtract $12$ from both sides of the equation.

$3 x - 3 y + 3 z = 6 - 12$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.2.2

Add $3 y$ to both sides of the equation.

$3 x + 3 z = 6 - 12 + 3 y$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.2.3

Subtract $3 z$ from both sides of the equation.

$3 x = 6 - 12 + 3 y - 3 z$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.2.4

Subtract $12$ from $6$ .

$3 x = - 6 + 3 y - 3 z$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$3 x = - 6 + 3 y - 3 z$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.3

Divide each term in $3 x = - 6 + 3 y - 3 z$ by $3$ and simplify.

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Step 2.3.1

Divide each term in $3 x = - 6 + 3 y - 3 z$ by $3$ .

$\frac{3 x}{3} = \frac{- 6}{3} + \frac{3 y}{3} + \frac{- 3 z}{3}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.3.2

Simplify the left side.

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Step 2.3.2.1

Cancel the common factor of $3$ .

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Step 2.3.2.1.1

Cancel the common factor.

$\frac{3 x}{3} = \frac{- 6}{3} + \frac{3 y}{3} + \frac{- 3 z}{3}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.3.2.1.2

Divide $x$ by $1$ .

$x = \frac{- 6}{3} + \frac{3 y}{3} + \frac{- 3 z}{3}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$x = \frac{- 6}{3} + \frac{3 y}{3} + \frac{- 3 z}{3}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$x = \frac{- 6}{3} + \frac{3 y}{3} + \frac{- 3 z}{3}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.3.3

Simplify the right side.

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Step 2.3.3.1

Simplify each term.

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Step 2.3.3.1.1

Divide $- 6$ by $3$ .

$x = - 2 + \frac{3 y}{3} + \frac{- 3 z}{3}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.3.3.1.2

Cancel the common factor of $3$ .

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Step 2.3.3.1.2.1

Cancel the common factor.

$x = - 2 + \frac{3 y}{3} + \frac{- 3 z}{3}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.3.3.1.2.2

Divide $y$ by $1$ .

$x = - 2 + y + \frac{- 3 z}{3}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$x = - 2 + y + \frac{- 3 z}{3}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.3.3.1.3

Cancel the common factor of $- 3$ and $3$ .

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Step 2.3.3.1.3.1

Factor $3$ out of $- 3 z$ .

$x = - 2 + y + \frac{3 (- z)}{3}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.3.3.1.3.2

Cancel the common factors.

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Step 2.3.3.1.3.2.1

Factor $3$ out of $3$ .

$x = - 2 + y + \frac{3 (- z)}{3 (1)}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.3.3.1.3.2.2

Cancel the common factor.

$x = - 2 + y + \frac{3 (- z)}{3 \cdot 1}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.3.3.1.3.2.3

Rewrite the expression.

$x = - 2 + y + \frac{- z}{1}$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 2.3.3.1.3.2.4

Divide $- z$ by $1$ .

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- w + 2 x + y + 2 z = 3$

Step 3

Solve the equation for $y$ .

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Step 3.1

Simplify $- (- 3 - (- 2 + y - z) + y - z) + 2 (- 2 + y - z) + y + 2 z$ .

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Step 3.1.1

Simplify each term.

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Step 3.1.1.1

Simplify each term.

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Step 3.1.1.1.1

Apply the distributive property.

$- (- 3 + 2 - y + z + y - z) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.1.2

Simplify.

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Step 3.1.1.1.2.1

Multiply $- 1$ by $- 2$ .

$- (- 3 + 2 - y + z + y - z) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.1.2.2

Multiply $- - z$ .

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Step 3.1.1.1.2.2.1

Multiply $- 1$ by $- 1$ .

$- (- 3 + 2 - y + 1 z + y - z) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.1.2.2.2

Multiply $z$ by $1$ .

$- (- 3 + 2 - y + z + y - z) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- (- 3 + 2 - y + z + y - z) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- (- 3 + 2 - y + z + y - z) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- (- 3 + 2 - y + z + y - z) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.2

Combine the opposite terms in $- 3 + 2 - y + z + y - z$ .

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Step 3.1.1.2.1

Add $- y$ and $y$ .

$- (- 3 + 2 + z + 0 - z) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.2.2

Add $- 3 + 2 + z$ and $0$ .

$- (- 3 + 2 + z - z) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.2.3

Subtract $z$ from $z$ .

$- (- 3 + 2 + 0) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.2.4

Add $- 3 + 2$ and $0$ .

$- (- 3 + 2) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- (- 3 + 2) + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.3

Add $- 3$ and $2$ .

$1 + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.4

Multiply $- 1$ by $- 1$ .

$1 + 2 (- 2 + y - z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.5

Apply the distributive property.

$1 + 2 \cdot - 2 + 2 y + 2 (- z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.6

Simplify.

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Step 3.1.1.6.1

Multiply $2$ by $- 2$ .

$1 - 4 + 2 y + 2 (- z) + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.1.6.2

Multiply $- 1$ by $2$ .

$1 - 4 + 2 y - 2 z + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$1 - 4 + 2 y - 2 z + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$1 - 4 + 2 y - 2 z + y + 2 z = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.2

Simplify by adding terms.

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Step 3.1.2.1

Combine the opposite terms in $1 - 4 + 2 y - 2 z + y + 2 z$ .

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Step 3.1.2.1.1

Add $- 2 z$ and $2 z$ .

$1 - 4 + 2 y + y + 0 = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.2.1.2

Add $1 - 4 + 2 y + y$ and $0$ .

$1 - 4 + 2 y + y = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$1 - 4 + 2 y + y = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.2.2

Subtract $4$ from $1$ .

$- 3 + 2 y + y = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.1.2.3

Add $2 y$ and $y$ .

$- 3 + 3 y = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- 3 + 3 y = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$- 3 + 3 y = 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.2

Move all terms not containing $y$ to the right side of the equation.

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Step 3.2.1

Add $3$ to both sides of the equation.

$3 y = 3 + 3$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.2.2

Add $3$ and $3$ .

$3 y = 6$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$3 y = 6$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.3

Divide each term in $3 y = 6$ by $3$ and simplify.

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Step 3.3.1

Divide each term in $3 y = 6$ by $3$ .

$\frac{3 y}{3} = \frac{6}{3}$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.3.2

Simplify the left side.

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Step 3.3.2.1

Cancel the common factor of $3$ .

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Step 3.3.2.1.1

Cancel the common factor.

$\frac{3 y}{3} = \frac{6}{3}$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{6}{3}$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$y = \frac{6}{3}$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$y = \frac{6}{3}$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 3.3.3

Simplify the right side.

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Step 3.3.3.1

Divide $6$ by $3$ .

$y = 2$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$y = 2$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$y = 2$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

$y = 2$

$x = - 2 + y - z$

$w = - 3 - x + y - z$

Step 4

Substitute the calculated values for $y$ into the equation for $x$ .

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Step 4.1

Simplify the left side.

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Step 4.1.1

Remove parentheses.

$x = - 2 + 2 - z$

$y = 2$

$w = - 3 - x + y - z$

$x = - 2 + 2 - z$

$y = 2$

$w = - 3 - x + y - z$

Step 4.2

Simplify the right side.

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Step 4.2.1

Simplify $- 2 + 2 - z$ .

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Step 4.2.1.1

Add $- 2$ and $2$ .

$x = 0 - z$

$y = 2$

$w = - 3 - x + y - z$

Step 4.2.1.2

Subtract $z$ from $0$ .

$x = - z$

$y = 2$

$w = - 3 - x + y - z$

$x = - z$

$y = 2$

$w = - 3 - x + y - z$

$x = - z$

$y = 2$

$w = - 3 - x + y - z$

$x = - z$

$y = 2$

$w = - 3 - x + y - z$

Step 5

Substitute the calculated values for $x, y$ into the equation for $w$ .

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Step 5.1

Simplify the left side.

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Step 5.1.1

Remove parentheses.

$w = - 3 - (- z) + 2 - z$

$x = - z$

$y = 2$

$w = - 3 - (- z) + 2 - z$

$x = - z$

$y = 2$

Step 5.2

Simplify the right side.

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Step 5.2.1

Simplify $- 3 - (- z) + 2 - z$ .

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Step 5.2.1.1

Multiply $- (- z)$ .

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Step 5.2.1.1.1

Multiply $- 1$ by $- 1$ .

$w = - 3 + 1 z + 2 - z$

$x = - z$

$y = 2$

Step 5.2.1.1.2

Multiply $z$ by $1$ .

$w = - 3 + z + 2 - z$

$x = - z$

$y = 2$

$w = - 3 + z + 2 - z$

$x = - z$

$y = 2$

Step 5.2.1.2

Combine the opposite terms in $- 3 + z + 2 - z$ .

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Step 5.2.1.2.1

Subtract $z$ from $z$ .

$w = - 3 + 0 + 2$

$x = - z$

$y = 2$

Step 5.2.1.2.2

Add $- 3$ and $0$ .

$w = - 3 + 2$

$x = - z$

$y = 2$

$w = - 3 + 2$

$x = - z$

$y = 2$

Step 5.2.1.3

Add $- 3$ and $2$ .

$w = - 1$

$x = - z$

$y = 2$

$w = - 1$

$x = - z$

$y = 2$

$w = - 1$

$x = - z$

$y = 2$

$w = - 1$

$x = - z$

$y = 2$