Question

What is the slope of a line that is perpendicular to AB if the coordinates of A are (–4, 1) and the coordinates of B are (1, –1)?

-2/5
5/2
2/5
- 5/2

Answer 1

Find the slope of line AB first.

AB =
`(y2 - y1)/(x2 - x1)`
AB =
`(-1 - 1)/(1 - -4)`
AB =
`(-2)/(5)`

We know that the slope of the line perpendicular should be opposite and reciprocal.

SO the answer is 5/2

Hope this helps :)