Garis k melalui titik (2,p ) dan (1,-5) bergradien 3/2, nilai p adalah…
m = 3/2
y2-y1/x2-x1 = 3/2
-5-p/1-2 = 3/2
-5-p/-1 = 3/2 (kalikan silang)
2(-5-p) = -3
-10-2p = -3
-2p = 7
p = -7/2