Pre-Algebra Examples

Find Any Equation Perpendicular to the Line
Choose a point that the perpendicular line will pass through.
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.
Find the equation of the perpendicular line using the point-slope formula.
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Find the value of using the formula for the equation of a line.
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Use the formula for the equation of a line to find .
Substitute the value of into the equation.
Substitute the value of into the equation.
Substitute the value of into the equation.
Find the value of .
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Rewrite the equation as .
Simplify the left side.
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Simplify each term.
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Multiply by to get .
Simplify .
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Multiply by to get .
Multiply by to get .
Add and to get .
Now that the values of (slope) and (y-intercept) are known, substitute them into to find the equation of the line.
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