persamaan aris yan melalui titik(-3,6)dan(1,4)

jawab 
persamaan garis
A(x1,y1) = (- 3, 6)
B (x2,y2) = (1 , 4)

(y - y1) (x2 - x1) = (x - x1)(y2 -y1)
(y - 6)(1 + 3)  =(x + 3)/(4 -6)
4( y - 6) = -2( x + 3)
4y - 24 = -2x - 6
2x + 4y = -6 +24 
2x + 4y =18 ....bagi 2
x + 2y = 9