Diketahui sebuah garis yang melalui (-2,p) dan (3p,-5), dengan gradien ¾ Berapakah nilai p?

m = 3/4
x1 = -2
y1 = p
x2 = 3p
y2 = -5

m = y2-y1/x2-x1
3/4 = -5-p/3p-(-2)
3/4 = -5-p/3p+2
3(3p+2) = 4(-5-p)
9p+6 = -20-4p
9p+4p = -20-6
13p = -26
p = -26/13
p = -2