You can put this solution on YOUR website! 10x-10y=0
5x-4y=8 <- Multiply this equation by 2, which gives you 10x-8y=16. Subtract this equation from the first.
10x-10y=0
-10x-8y=16
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-2y=-16
so y=8. Substitute this value for y back in one of the original equations to solve for x.