# Pre-Algebra Examples

Choose a point that the perpendicular line will pass through.

Subtract from both sides of the equation.

Divide each term by and simplify.

Divide each term in by .

Reduce the expression by cancelling the common factors.

Cancel the common factor.

Divide by .

Move the negative in front of the fraction.

The slope-intercept form is , where is the slope and is the y-intercept.

Using the slope-intercept form, the slope is .

The equation of a perpendicular line to must have a slope that is the negative reciprocal of the original slope.

Reduce the expression by cancelling the common factors.

Rewrite as .

Move the negative in front of the fraction.

Multiply the numerator by the reciprocal of the denominator.

Multiply by .

Multiply .

Multiply by .

Multiply by .

Using the point-slope form , plug in , , and .

Solve for .

Subtract from .

Simplify .

Subtract from .

Combine and .

Reorder terms.