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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

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13y ago

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