SOLUTION: Solve by substitution 8m-n+70 m-2n=13

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Question 466224: Solve by substitution
8m-n+70
m-2n=13
Answer by Love math(28) About Me  (Show Source):
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8m-n+70....time(-2) you get:.....-16m+2n=140
m-2n=13............................m-2n =13
..........................Add------------------
.....................................-15m=153
.......................................m= 153/-15
........................................m = -51/5
restitution m = 51/5 , find n
51/5-2n=13
....-2n=13-(-51/5)
......n=(116/5)/-2
......n=-58/5