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m2 = 1 karena mereka sejajar
y - y1 = m ( x-x1)
y - (-1) = 1(x- (-2))
y + 1 = 1(x + 2)
y + 1 = x + 2
y + 1 -x -2 = 0
y - x - 1 = 0
atau y -x = 1