gradien garis k adalh

c : d = 2 : 5
c = 2d/5

k = (3d+4 - (d+4))/(2c-1 - (c-1))
k = (3d-d +4-4)/(2c-c -1+1)
k = 2d/c
k = 2d/(2d/5)
k = 2d x 5/2d
k = 5