Question

Tell whether the lines for each pair of equations are parallel, perpendicular, or neither.


x + 5y = -20

y = – 7/8 x – 1

32x – 28y = –36

parallel
perpendicular
neither

Answer 1

All you need is the slope.

-1/5
-7/8
8/7

#2 and #3 are perpendicular. Done.