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y= mx + b
m = 2
karena tegak lurus maka :
m1 . m2 = -1
2 . m2 = -1
m2 = - 1/2
y- y1 = m2 (x-x1)
y - 6 = - 1/2 (x -2)
y- 6 = - 1/2x + 1
y = - 1/2x + 7