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y+1 = 1/2 (x-0)
y+1 = 1/2x-0
-----------x2
2y+2 = 1x-0
2y = x-2
Persamaan garis lurus dengan m = 1/2 dan melalui titik (0, -1) adalah:
y - = m(x - )
y - (-1) = (x - 0)
2(y + 1) = x
2y + 2 = x
2y - x = -2