-2
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4x + y = 9 so that y = 9 - 4x 7x - 8y = 6 7x - 8*(9-4x) = 6 7x - 72 + 32x = 6 39x = 78 x = 2 Then y = 9 - 4x = 9-4*2 = 9-8 = 1
Y+7=9 equals 2+7=9.
If you mean: y = 3(-3/2)2+9(-3/2)-8 Then: y = -59/4 or as -14.75
6 + y = 8 y = 8 - 6 y = 2
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