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tegak lurus => m1.m2 = -1
m1.m2 = -1
.m2 = -1
m2 =
melalui titik (-1, 2) ==>(x1, y1)
persamaan garisnya :
y - y1 = m(x - x1)
y -2 = (x + 1)
y - 2 = +
3y - 6 = 4x + 4
3y - 4x - 10 = 0
4(2)= -3(-1) + 5
8= 3 + 5
8=8