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X - 1, 2, 3, 4
Y - 1, 6, 9, 12
(1, 1), (2, 6), (3,9), (4,12)
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y = -2x
X = 1, 2, 3, 4
Y = -2, -4. -6, -8
(1, -2, (2, -4, (3,-6, (4,-8)