Perhatikan gambar!. Persamaan garis k adalah

garis 1 = (3,0)(0,-2)
m 1 = -2-0/ 0-3= 2/3
m1 x mk = -1
mk = -1 x 3/2
mk = -3/2

0=-3/2 x 3 + c
0= -9/2 + c
c = 9/2

y=-3/2x + 9/2
2y = -3x +9
3x+2y = 9