You can put this solution on YOUR website! I'm not sure how you are suppose to solve this, so I will use elimination;
x+5y=10
-2x-10y= -20
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(2)x+5y=10
2x+10y=20
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2x+10y=20
-2x-10y=-20
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0=0
This has infinitely many solutions, when it is graphed it is the same line
:)