Question

Find the slope of a line that is a) parallel and b) perpendicular to the given line:
-4x-9y=-4

Answer 1

a) 4/9 b)-9/4

Answer 2

y=4/9-4x/9

Answer 3

How did you figure it out?

Answer 4

you plug in the values.

Answer 5

Solve for y:
Then compare it with y=mx + b where "m" is the slope.

Answer 6

4x+ 9y=4
-> 9y = -4x + 4
-> y = -4x/9 + 4/9
slope m = -4/9
Slope of parallel line = - 4/9
Slope of perpendicular line = +9/4