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m1 = 1/5
m1 x m2 = -1
1/5 x m2 = -1
m2 = -5
melalui titik (2,-5)
y - y1 = m2(x - x1)
y - (-5) = -5(x-2)
y+5 = -5x + 10
y = -5x +5