Answer:
-1/4
Step-by-step explanation: 6 19 17 52
12x - 3y = 81 factor out a 3
4x - y = 27 convert to slope intercept form
-y = -4x + 27 multiply both sides by -1
y = 4x - 27 slope of this line is m = 4, so the slope of a line perpendicular to this line is the negative recipocal of the slope is -1/m which is -1/4
