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m1 = (-3-2)/(-5-5) = -5/-10 = 1/2
tegak lurus m2 = -1/m1 = -1/(1/2) = -2
pers garis yg melalui titik (-3,2) =
y - 2 = -2 (x+3)
y - 2 = -2x - 6
y = -2x - 6 +2
y = -2x -4
y + 2x + 4 = 0