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karena tegak lurus
m1 = -1
m1 . m2 = -1
-1 . m2 = -1
m2 = 1
melalui titik ( 2 -3 )
y-y1 = m2 ( x -x1 )
y-(-3 ) = 1 ( x - 2)
y +3 = x-2
y = x- 2 -3
y = x -5