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x-y=0

x=y

so you will use that in the other equation by substituting every y with x

2x+y=0

2x+x=0

3x=0

x=0/3

x=0

then use that in the previous equation by substituting every x with 0

x=y

0=y; y=0

finally x=0 and y=0

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Q: How do you Solve 2x plus y equals 0 and x-y equals 0?
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