# Precalculus Examples

, ,

Choose two equations and eliminate one variable. In this case, eliminate .

Multiply each equation by the value that makes the coefficients of opposite.

Simplify.

Multiply by .

Simplify the left side.

Multiply by .

Apply the distributive property.

Simplify.

Multiply by .

Multiply by .

Add the two equations together to eliminate from the system.

The resultant equation has eliminated.

Choose another two equations and eliminate .

Multiply each equation by the value that makes the coefficients of opposite.

Simplify.

Multiply by .

Simplify the left side.

Multiply by .

Apply the distributive property.

Simplify.

Multiply by .

Multiply by .

Multiply by .

Multiply by .

Simplify the left side.

Multiply by .

Apply the distributive property.

Simplify.

Multiply by .

Multiply by .

Add the two equations together to eliminate from the system.

The resultant equation has eliminated.

Take the resultant equations and eliminate another variable. In this case, eliminate .

Multiply each equation by the value that makes the coefficients of opposite.

Simplify.

Multiply by .

Simplify the left side.

Multiply by .

Apply the distributive property.

Multiply.

Multiply by .

Multiply by .

Add the two equations together to eliminate from the system.

The resultant equation has eliminated.

Divide each term by and simplify.

Divide each term in by .

Simplify the left side of the by cancelling the common factors.

Reduce the expression by cancelling the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Move the negative one from the denominator of .

Simplify the expression.

Multiply by .

Rewrite as .

Simplify the right side of the equation.

Reduce the expression by cancelling the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Move the negative in front of the fraction.

Substitute the value of into an equation with eliminated already.

Solve for .

Simplify each term.

Cancel the common factor of .

Write as a fraction with denominator .

Factor out the greatest common factor .

Cancel the common factor.

Rewrite the expression.

Multiply and .

Subtract from both sides of the equation.

Divide each term by and simplify.

Divide each term in by .

Simplify the left side of the by cancelling the common factors.

Reduce the expression by cancelling the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Move the negative one from the denominator of .

Simplify the expression.

Multiply by .

Rewrite as .

Simplify the right side of the equation.

Cancel the common factor of .

Rewrite.

Rewrite.

Factor out the greatest common factor .

Cancel the common factor.

Rewrite the expression.

Reduce the expression by cancelling the common factors.

Cancel the common factor.

Rewrite the expression.

Simplify.

Multiply and .

Multiply by .

Substitute the value of each known variable into one of the initial equations.

Solve for .

Simplify the left side.

Simplify each term.

Cancel the common factor of .

Write as a fraction with denominator .

Factor out the greatest common factor .

Cancel the common factor.

Rewrite the expression.

Simplify.

Multiply and .

Divide by .

Simplify .

Write as a fraction with denominator .

Multiply and .

Divide by .

Subtract from .

Subtract from both sides of the equation.

The solution can be shown in both point and equation forms.

Point Form:

Equation Form: