persamaan garis melalui titik P(12,-5) dengan gradient -2/3 adalah

y - y1 = m (x - x1)
y + 5 = -2/3 (x - 12
3y + 15 = -2x + 24
2x + 3y - 9 = 0
3y = -2x + 9
y = 2/3 x + 3

m= -2/3
x1= 12
y1= -5

y-y1 = m(x-x1)
y+5 = - 2/3 (x-12)
y= -2/3 x + 8 - 5
y= -2/3 x + 3
3y = -2x + 9
2x+3y-9=0