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18. Which table represents a non-proportional relationship between x and y? X 1 3 7 15 Y -4 -12 -28 -60 X 1 4 7 10 Y 7.5 30 52.5 75 X -17 -5 2 10 Y 93.5 27.5 -11 -55 X -5 -1 1 8 Y 11 -1 -7 -28 10 X -5 -1 1 8 Y 7.5 30 52.5 75 y 11 - 1 -7 -28​