Question

Persamaan garis yang melalui titik (-3,6) dan (1,4) adalah?
A. x+2y=9
B. 2x+y=15
C. x-2y=15
D. 2x-y=9

Answer 1

(y - y1) / (y2 - y1) = (x - x1) / (x2 - x1)
(y - 6) / (4 - 6) = (x -(-3)) / (1 - (-3))
(y - 6)/(-2) = (x + 3)/4
4(y - 6) = -2(x + 3)
2(y - 6) = -(x + 3)
2y - 12 = -x - 3
2y + x = 12 - 3
x + 2y = 9

Answer 2

Y-y1/y2-y1 = x-x1/x2-x1
y-6/4-6 = x+3/1+3
y-6/-2 = x+3/4 (disederhanakan)
y-6/-1=x+3/2 (kalisilang)

2(y-6)=-1(x+3)
2y-12 = -x - 3
2y + x = -3 + 12
2y+x=9

atobisa jjugala dibalek x+2y=9(a)