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x+y=10 x-y=20 how do you solving systems of equations with elimination

Sagot :

konrad509
[tex]x+y=10\\ \underline{x-y=20}\\ 2x=30\\ x=15\\\\ 15+y=10\\ y=-5\\\\ \boxed{(x,y)=(15,-5)}[/tex]
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