If you mean -2x+y = 8 then y = 2x+8 as a straight line equation
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If you mean 2x-y = 8 then y = 2x-8
2x-y8 where x is 6: xy=8-2=6
You cant solve it unless it is an equation. To be an equation it must have an equals sign.
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If you mean: x+y = 8 and -x+2y = 7 then they are simultaneous equations whose solutions are x = 3 and y = 5