yang jago mtk boleh masuk dong bantuin

Pers. garis g
y+1/-3+1 = x-4/0-4
y+1/-2 = x-4/-4
y+1 = x-4/2
2y+2 = x-4
x-2y = 6
Gradien garis g : mg = -a/b = -1/-2 = ½

Tegak lurus dgn garis p, jika :
mg × mp = -1
½ × mp = -1
mp = -2
Maka, garis g akan tegak lurus dgn garis bergradien -2
a. 2x-y = 1 → m = -2/-1 = 2
b. x+2y = 5 → m = -1/2
c. 2x+y = 1 → m = -2/1 = -2 ♣ ♣ ♣
d. x-2y = 5 → m = -1/-2 = 1/2