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y = mx + b
m = -1/2
karena tegak lurus maka :
m1 . m2 = -1
-1/2 . m2 = -1
m2 = 2
y-y1 = m2(x -x1)
y-5 = 2(x -2)
y = 2x-4+5
y = 2x +1