solve by substituition 8m+n=61 m-7n=29
just cant figure this one out
1) 8m + n = 61
2) m - 7n = 29
Either solve equation 1 for n and substitute that into
equation 2, or solve equation 2 for m and substitute
that into equation 1.
8m + n = 61
8m + n - 8m = 61 - 8m
n = 61 - 8m
m - 7n = 29
m - 7(61 - 8m) = 29
m - 427 + 56m = 29
57m - 427 = 29
57m - 427 + 427 = 29 + 427
57m = 456
57m / 57 = 456 / 57
m = 8
Now, you can solve for nin equation 1.
8m + n = 61
8(8) + n = 61
64 + n = 61
64 + n - 64 = 61 - 64
n = -3
Check it with equation 2.
m - 7n = 29
8 - 7(-3) = 29
8 + 21 = 29
29 = 29
m = 8, n = -3