2n + m + 5 = 15 3m + n + 5 = 15 what is m, and n
Rewrite these as:
2n + m = 10. (1)
n + 3m = 10. (2).
Rewrite (2) as: n = 10 - 3m (3)
Use (3) in (1)
2(10 - 3m) + m = 10
20 - 6m + m = 10
10 = 5m
m = 2
Put this into (3)
n = 10 - 3*2
n = 4
m and n are variables
