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m = -a/b = -2/-3 = 2/3
gadien utk persamaan garis yg melalui (-2,5) = -1/m
= -3/2
persamaan garis :
y - y1 = m (x-x1)
y - 5 = -3/2 (x- (-2)) <<<masing" kali 2
2y - 10 = -3 (x +2)
2y -10 = -3x -6
3x + 2y = 10 - 6
3x + 2y = 4
3y = 2x+12
y = 2/3 x+4
gradiennya 2/3
misalkan gradien garis baru adalah m, karen saling tegak lurus, maka:
2/3 . m = -1
m = -3/2
y-y1 = m(x-x1)
y-5 = -3/2(x+2)
2y-10 = -3x-6
3x+2y = -6+10
3x+2y = 4
jawab: D