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y - 2 = 1/2 ( x + 1 )
y - 2 = 1/2 x + 1/2
y =1/2 x +1/2 +2
y =1/2 x + 2 1/2 (5/2) atau 2y = 1x + 5 atau x = 2y - 5
berarti x + 2y - 5 =0