Question 621361
2m+n=1
m-n=8

so m=8-n (from second equation)

So put this into first equation:

2(8-n) + n =  1

solve for n:

16 - 2n + n = 1
-n = 1 - 16
-n = -15
so n = 15

To find m:

m=8-n
m=8-15
m= -7

So n=15, m=-7

To check put into 2m+n=1

2(-7) + 15 = 1
-14 + 15 = 1 !!!