Precalculus Examples

$u = - 8 i + 1 j$ , $v = 6 i + 1 j$

Step 1

Simplify $- 8 i + 1 j$ .

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Multiply $j$ by $1$ .

$u = - 8 i + j$

$v = 6 i + 1 j$

Reorder $- 8 i$ and $j$ .

$u = j - 8 i$

$v = 6 i + 1 j$

$u = j - 8 i$

$v = 6 i + 1 j$

Step 2

Solve the equation for $i$ .

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Rewrite the equation as $6 i + 1 j = v$ .

$6 i + 1 j = v$

$u = j - 8 i$

Multiply $j$ by $1$ .

$6 i + j = v$

$u = j - 8 i$

Subtract $j$ from both sides of the equation.

$6 i = v - j$

$u = j - 8 i$

Divide each term in $6 i = v - j$ by $6$ and simplify.

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Divide each term in $6 i = v - j$ by $6$ .

$\frac{6 i}{6} = \frac{v}{6} + \frac{- j}{6}$

$u = j - 8 i$

Simplify the left side.

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Cancel the common factor of $6$ .

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Cancel the common factor.

$\frac{6 i}{6} = \frac{v}{6} + \frac{- j}{6}$

$u = j - 8 i$

Divide $i$ by $1$ .

$i = \frac{v}{6} + \frac{- j}{6}$

$u = j - 8 i$

$i = \frac{v}{6} + \frac{- j}{6}$

$u = j - 8 i$

$i = \frac{v}{6} + \frac{- j}{6}$

$u = j - 8 i$

Simplify the right side.

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Move the negative in front of the fraction.

$i = \frac{v}{6} - \frac{j}{6}$

$u = j - 8 i$

$i = \frac{v}{6} - \frac{j}{6}$

$u = j - 8 i$

$i = \frac{v}{6} - \frac{j}{6}$

$u = j - 8 i$

$i = \frac{v}{6} - \frac{j}{6}$

$u = j - 8 i$

Step 3

Solve the equation for $j$ .

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Simplify $j - 8 (\frac{v}{6} - \frac{j}{6})$ .

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Simplify each term.

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Apply the distributive property.

$j - 8 \frac{v}{6} - 8 (- \frac{j}{6}) = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Cancel the common factor of $2$ .

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Factor $2$ out of $- 8$ .

$j + 2 (- 4) (\frac{v}{6}) - 8 (- \frac{j}{6}) = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $2$ out of $6$ .

$j + 2 \cdot (- 4 \frac{v}{2 \cdot 3}) - 8 (- \frac{j}{6}) = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Cancel the common factor.

$j + 2 \cdot (- 4 \frac{v}{2 \cdot 3}) - 8 (- \frac{j}{6}) = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Rewrite the expression.

$j - 4 \frac{v}{3} - 8 (- \frac{j}{6}) = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

$j - 4 \frac{v}{3} - 8 (- \frac{j}{6}) = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Combine $- 4$ and $\frac{v}{3}$ .

$j + \frac{- 4 v}{3} - 8 (- \frac{j}{6}) = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Cancel the common factor of $2$ .

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Move the leading negative in $- \frac{j}{6}$ into the numerator.

$j + \frac{- 4 v}{3} - 8 \frac{- j}{6} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $2$ out of $- 8$ .

$j + \frac{- 4 v}{3} + 2 (- 4) (\frac{- j}{6}) = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $2$ out of $6$ .

$j + \frac{- 4 v}{3} + 2 \cdot (- 4 \frac{- j}{2 \cdot 3}) = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Cancel the common factor.

$j + \frac{- 4 v}{3} + 2 \cdot (- 4 \frac{- j}{2 \cdot 3}) = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Rewrite the expression.

$j + \frac{- 4 v}{3} - 4 \frac{- j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

$j + \frac{- 4 v}{3} - 4 \frac{- j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Combine $- 4$ and $\frac{- j}{3}$ .

$j + \frac{- 4 v}{3} + \frac{- 4 (- j)}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Multiply $- 1$ by $- 4$ .

$j + \frac{- 4 v}{3} + \frac{4 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Move the negative in front of the fraction.

$j - \frac{4 v}{3} + \frac{4 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

$j - \frac{4 v}{3} + \frac{4 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

To write $j$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$- \frac{4 v}{3} + j \cdot \frac{3}{3} + \frac{4 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Simplify terms.

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Combine $j$ and $\frac{3}{3}$ .

$- \frac{4 v}{3} + \frac{j \cdot 3}{3} + \frac{4 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Combine the numerators over the common denominator.

$- \frac{4 v}{3} + \frac{j \cdot 3 + 4 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Combine the numerators over the common denominator.

$\frac{- 4 v + j \cdot 3 + 4 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

$\frac{- 4 v + j \cdot 3 + 4 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Move $3$ to the left of $j$ .

$\frac{- 4 v + 3 j + 4 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Simplify terms.

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Add $3 j$ and $4 j$ .

$\frac{- 4 v + 7 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $- 1$ out of $- 4 v$ .

$\frac{- (4 v) + 7 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $- 1$ out of $7 j$ .

$\frac{- (4 v) - (- 7 j)}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $- 1$ out of $- (4 v) - (- 7 j)$ .

$\frac{- (4 v - 7 j)}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Simplify the expression.

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Rewrite $- (4 v - 7 j)$ as $- 1 (4 v - 7 j)$ .

$\frac{- 1 (4 v - 7 j)}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Move the negative in front of the fraction.

$- \frac{4 v - 7 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

$- \frac{4 v - 7 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

$- \frac{4 v - 7 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

$- \frac{4 v - 7 j}{3} = - 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Simplify $- 8 (\frac{v}{6} - \frac{j}{6}) + 1 j$ .

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Simplify each term.

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Apply the distributive property.

$- \frac{4 v - 7 j}{3} = - 8 \frac{v}{6} - 8 (- \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Cancel the common factor of $2$ .

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Factor $2$ out of $- 8$ .

$- \frac{4 v - 7 j}{3} = 2 (- 4) (\frac{v}{6}) - 8 (- \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $2$ out of $6$ .

$- \frac{4 v - 7 j}{3} = 2 \cdot (- 4 \frac{v}{2 \cdot 3}) - 8 (- \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Cancel the common factor.

$- \frac{4 v - 7 j}{3} = 2 \cdot (- 4 \frac{v}{2 \cdot 3}) - 8 (- \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Rewrite the expression.

$- \frac{4 v - 7 j}{3} = - 4 \frac{v}{3} - 8 (- \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

$- \frac{4 v - 7 j}{3} = - 4 \frac{v}{3} - 8 (- \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Combine $- 4$ and $\frac{v}{3}$ .

$- \frac{4 v - 7 j}{3} = \frac{- 4 v}{3} - 8 (- \frac{j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Cancel the common factor of $2$ .

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Move the leading negative in $- \frac{j}{6}$ into the numerator.

$- \frac{4 v - 7 j}{3} = \frac{- 4 v}{3} - 8 \frac{- j}{6} + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $2$ out of $- 8$ .

$- \frac{4 v - 7 j}{3} = \frac{- 4 v}{3} + 2 (- 4) (\frac{- j}{6}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $2$ out of $6$ .

$- \frac{4 v - 7 j}{3} = \frac{- 4 v}{3} + 2 \cdot (- 4 \frac{- j}{2 \cdot 3}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Cancel the common factor.

$- \frac{4 v - 7 j}{3} = \frac{- 4 v}{3} + 2 \cdot (- 4 \frac{- j}{2 \cdot 3}) + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Rewrite the expression.

$- \frac{4 v - 7 j}{3} = \frac{- 4 v}{3} - 4 \frac{- j}{3} + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

$- \frac{4 v - 7 j}{3} = \frac{- 4 v}{3} - 4 \frac{- j}{3} + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Combine $- 4$ and $\frac{- j}{3}$ .

$- \frac{4 v - 7 j}{3} = \frac{- 4 v}{3} + \frac{- 4 (- j)}{3} + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Multiply $- 1$ by $- 4$ .

$- \frac{4 v - 7 j}{3} = \frac{- 4 v}{3} + \frac{4 j}{3} + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Move the negative in front of the fraction.

$- \frac{4 v - 7 j}{3} = - \frac{4 v}{3} + \frac{4 j}{3} + 1 j$

$i = \frac{v}{6} - \frac{j}{6}$

Multiply $j$ by $1$ .

$- \frac{4 v - 7 j}{3} = - \frac{4 v}{3} + \frac{4 j}{3} + j$

$i = \frac{v}{6} - \frac{j}{6}$

$- \frac{4 v - 7 j}{3} = - \frac{4 v}{3} + \frac{4 j}{3} + j$

$i = \frac{v}{6} - \frac{j}{6}$

To write $j$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$- \frac{4 v - 7 j}{3} = - \frac{4 v}{3} + \frac{4 j}{3} + j \cdot \frac{3}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

Simplify terms.

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Combine $j$ and $\frac{3}{3}$ .

$- \frac{4 v - 7 j}{3} = - \frac{4 v}{3} + \frac{4 j}{3} + \frac{j \cdot 3}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

Combine the numerators over the common denominator.

$- \frac{4 v - 7 j}{3} = - \frac{4 v}{3} + \frac{4 j + j \cdot 3}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

Combine the numerators over the common denominator.

$- \frac{4 v - 7 j}{3} = \frac{- 4 v + 4 j + j \cdot 3}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

$- \frac{4 v - 7 j}{3} = \frac{- 4 v + 4 j + j \cdot 3}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

Move $3$ to the left of $j$ .

$- \frac{4 v - 7 j}{3} = \frac{- 4 v + 4 j + 3 j}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

Simplify terms.

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Add $4 j$ and $3 j$ .

$- \frac{4 v - 7 j}{3} = \frac{- 4 v + 7 j}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $- 1$ out of $- 4 v$ .

$- \frac{4 v - 7 j}{3} = \frac{- (4 v) + 7 j}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $- 1$ out of $7 j$ .

$- \frac{4 v - 7 j}{3} = \frac{- (4 v) - (- 7 j)}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

Factor $- 1$ out of $- (4 v) - (- 7 j)$ .

$- \frac{4 v - 7 j}{3} = \frac{- (4 v - 7 j)}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

Simplify the expression.

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Rewrite $- (4 v - 7 j)$ as $- 1 (4 v - 7 j)$ .

$- \frac{4 v - 7 j}{3} = \frac{- 1 (4 v - 7 j)}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

Move the negative in front of the fraction.

$- \frac{4 v - 7 j}{3} = - \frac{4 v - 7 j}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

$- \frac{4 v - 7 j}{3} = - \frac{4 v - 7 j}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

$- \frac{4 v - 7 j}{3} = - \frac{4 v - 7 j}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

$- \frac{4 v - 7 j}{3} = - \frac{4 v - 7 j}{3}$

$i = \frac{v}{6} - \frac{j}{6}$

Move all terms containing $j$ to the left side of the equation.

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Add $\frac{4 v - 7 j}{3}$ to both sides of the equation.

$- \frac{4 v - 7 j}{3} + \frac{4 v - 7 j}{3} = 0$

$i = \frac{v}{6} - \frac{j}{6}$

Combine the numerators over the common denominator.

$\frac{- (4 v - 7 j) + 4 v - 7 j}{3} = 0$

$i = \frac{v}{6} - \frac{j}{6}$

Simplify each term.

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Apply the distributive property.

$\frac{- (4 v) - (- 7 j) + 4 v - 7 j}{3} = 0$

$i = \frac{v}{6} - \frac{j}{6}$

Multiply $4$ by $- 1$ .

$\frac{- 4 v - (- 7 j) + 4 v - 7 j}{3} = 0$

$i = \frac{v}{6} - \frac{j}{6}$

Multiply $- 7$ by $- 1$ .

$\frac{- 4 v + 7 j + 4 v - 7 j}{3} = 0$

$i = \frac{v}{6} - \frac{j}{6}$

$\frac{- 4 v + 7 j + 4 v - 7 j}{3} = 0$

$i = \frac{v}{6} - \frac{j}{6}$

Combine the opposite terms in $- 4 v + 7 j + 4 v - 7 j$ .

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Add $- 4 v$ and $4 v$ .

$\frac{7 j + 0 - 7 j}{3} = 0$

$i = \frac{v}{6} - \frac{j}{6}$

Add $7 j$ and $0$ .

$\frac{7 j - 7 j}{3} = 0$

$i = \frac{v}{6} - \frac{j}{6}$

Subtract $7 j$ from $7 j$ .

$\frac{0}{3} = 0$

$i = \frac{v}{6} - \frac{j}{6}$

$\frac{0}{3} = 0$

$i = \frac{v}{6} - \frac{j}{6}$

Divide $0$ by $3$ .

$0 = 0$

$i = \frac{v}{6} - \frac{j}{6}$

$0 = 0$

$i = \frac{v}{6} - \frac{j}{6}$

Since $0 = 0$ , the equation will always be true.

Always true

$i = \frac{v}{6} - \frac{j}{6}$

Always true

$i = \frac{v}{6} - \frac{j}{6}$

Step 4

Simplify the right side.

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Reorder $\frac{v}{6}$ and $- \frac{j}{6}$ .

$i = - \frac{j}{6} + \frac{v}{6}$

Always true

$i = - \frac{j}{6} + \frac{v}{6}$

Always true