**Question:**solve each solution by addition.

x+5y=10

-2x-10y=-20

**Answers:**

It's an open problem.

multiplying both sides of the first equation you get 2x+10y=20

and the second equation is -2x-10y=-20

when you add them you have 0=0

so the solution set for x, y is all real numbers.

Hope that helps! =-)

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