Problem 8 of 35alg-008
In the standard coordinate plane, what is the slope of a line perpendicular to ?
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Solution walkthrough1:49
- Solve for to see its slope: . The slope is the number on .
- A slope of means the line rises for every it runs to the right.
- A perpendicular line is the same line turned a quarter turn. The now goes down and the goes across.
- Rise over run for the new line is . Flip the fraction and change the sign: .
- Traps: is a parallel line, only changes the sign, and only flips.