Precalculus Examples

Find Any Equation Perpendicular to the Line
Choose a point that the perpendicular line will pass through.
Solve .
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Subtract from both sides of the equation.
Divide each term by and simplify.
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Divide each term in by .
Cancel the common factor of .
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Cancel the common factor.
Divide by .
Move the negative in front of the fraction.
Use the slope-intercept form to find the slope.
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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.
Simplify to find the slope of the perpendicular line.
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Cancel the common factor of and .
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Rewrite as .
Move the negative in front of the fraction.
Multiply the numerator by the reciprocal of the denominator.
Multiply by .
Multiply .
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Multiply by .
Multiply by .
Find the equation of the perpendicular line using the point-slope formula.
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Using the point-slope form , plug in , , and .
Solve for .
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Subtract from .
Simplify .
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Subtract from .
Combine and .
Reorder terms.
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