Question

A line L1 has slope -2/7. State whether the line that passes through (3,-4) and (-4,-2) is parallel or perpendicular to LINE L1. SHOW YOUR WORK!

Answer 1

Using the form y1 - y2/x1 - x2, we get:
-2 - (-4)/-4 - 3  =>  -2 + 4/-7  =>  2/-7  =>  -2/7. The slope is the same, therefore the lines are parallel.

Hope this helps.