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garis yg sejajar melalui ttik (-1,-4)
(y-y₁) = m ( x-x₁)
(y-(-4)) = 1/2 ( x-(-1))
y+4 = 1/2 (x+1)
2(y+4) = x+1
2y+8 = x+1
2y-x = 1-8
2y-x = -7
atau
2y = x-7
atau
y = 1/2x - 7/2
atau
2y-x+7= 0