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gradien tgk lurus = m1 x m2 = -1
2/3 x m2 = -1
m2 = -3/2
persamaan = y-y1 =m(x-x1)
= y -(-18) = -3/2 (x-12)
y+18 = 3/2x +18
y = 3/2x + 18 -18
y =3/2x