SOLUTION: 2m+n=12 m-9n=25 find the substitution method

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Question 500068: 2m+n=12
m-9n=25
find the substitution method
Answer by rfer(16322) About Me  (Show Source):
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m=9n+25
2m+n=12
2(9n+25)+n=12
18n+50+n=12
19n=12-50
19n=-38
n=-2
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2m+-2=12
2m=14
m=7
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7-9*-2=25
7+18=25