SOLUTION: Could someone please check my work and show me how to finish this problem? solve by substitution 7m+n=42, m-7n=56 7m+n=42 7m=42-n m=(42n)/7 m-7n=56 42-n-49=392

Question 436402: Could someone please check my work and show me how to finish this problem? solve by substitution
7m+n=42, m-7n=56
7m+n=42
7m=42-n
m=(42n)/7
m-7n=56
42-n-49=392
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
m-7n=56 m=7n+56
7m+n=42
7(7n+56)+n=42
49n+392+n=42
50n=-350
n=-7
---------------
7m-7=42
7m=49
m=7
----------------
proof
m-7n=56
7-7*-7=56
7+49=56
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