Respuesta :

amna04352

Answer:

m = 7, n = 5

Step-by-step explanation:

3m+3n=36

m + n = 12

n = 12 - m

8m-5n=31

8m - 5(12 - m) = 31

8m - 60 + 5m = 31

13m = 91

m = 7

n = 12 - 7

n = 5