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sejajar garis y=2x + 1
jwb : y= 2(1) + 1
y = 3
y = 2x +1
-2 = 2x + 1
-2 - 1 = 2x
-3 = 2x , x = -2/3
y - y1 = m(x-x1)
y + 2 = 2(x-1)
y + 2 = 2x - 2
y = 2x -2 -2
y = 2x - 4
y - 2x + 4 = 0