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as y = 5x + 64 we can substitute in the first equation getting 7x - 8 (5x + 64) =83 ie 7x -40x - 512 = 83 ie -33x = 595 so x = -18.03 and y = -26.15 Check: 7 x -18.03 = -126.15, 8 x -26.15 = -209.2 , difference 83.05, near enough for the Government.

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Q: 5x 8y40 solve for y
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