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diketahui titiknya (-1 ; 0) dan (0 ; 4)
y - y1 = ((y2 - y1)/(x2 - x1)) (x - x1)
y - 0 = ((4 - 0)/(0 + 1)) (x + 1)
y = 4(x + 1)
y = 4x + 4
4x - y > -4