SOLUTION: 2m+n=7 m-8n=80 solve by substitution Ty for your help

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Question 480943: 2m+n=7
m-8n=80
solve by substitution
Ty for your help
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

2m%2Bn=7.........1
m-8n=80........2
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2m%2Bn=7.........1..solve for n
n=7-2m.....substitute in 2


m-8n=80........2
m-8%287-2m%29=80
m-56%2B16m=80
17m=80%2B56
17m=136
m=136%2F17
highlight%28m=8%29......now find n

n=7-2m
n=7-2%2A8
n=7-16
highlight%28n=-9%29