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Home > AC > Chapter 8 > Lesson 8.1.3 > Problem 8-31

8-31.

Find the equation of a line perpendicular to the one graphed below that passes through the point .


Find the slope of the line at right by making a slope triangle.

Use the form of a line to start writing your equation.
Use the opposite reciprocal of the slope you found in order to make the line perpendicular to the one graphed at right.

Substitute the given point into the equation to solve for .



Substitute and back into their original places in the equation, and you have your equation for a line perpendicular to the one that is graphed at right.