Tolong dibantu ya..bsk dikumpulin

jawab
m = (y2-y1)/(x2-x1)

a)
mAB =(4-(-2))/(7-3) = 6/4 = 3/2
mBC =(7-4)/(9-7) = 3/2
mAC = (7-(-2))/(9-3) = 9/6 = 3/2

b) ketiganya bergradien sama , maka ketiga nya sejajar