Answer:
3/2
Step-by-step explanation:
First find the equation of the line passing through the two given points (-9, -4) and (3, 4). The change in x (the 'run') is 3 - (-9), or +12. The change in y (the 'rise') is 4 - (-4), or 8. Thus, the slope of this line is
m = rise/run = 8/12, or m = 2/3.
A line perpendicular to this one has a slope that is the negative reciprocal of the slope we just found:
m = -1 / (2/3) = -3/2
