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Mathematics 5 Online
OpenStudy (ashleyy_smith):

I'll give a medal (: ~~~~~ Use substitution to solve the system. −5x+4y=−21 3y+13=x

OpenStudy (anthonyym):

Solving with substitution means to solve one of the equations for either x or y and plug what you got into the other equation and solve from there.

OpenStudy (ibrafacts):

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