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karena tegak lurus mjd 1/2
y-y1 = m (x- x1)
y-2 = 1/2 (x-1)
y-2 = 1/2x- 1/2
2y- 4 = x-1
2y = x -1 + 4
2y = x +3
x- 2y + 3 = 0