Question

2m + 3n = 9 ………………. Ecuación 1
m + n = 4 ………………. Ecuación 2

Answer 1

Explicación paso a paso:

2m + 3n = 9

m + n = 4. (-2)

___________

2m + 3n = 9

-2m - 2n = -8

___________

2m-2m+3n-2n = 9-8

n=1

m+n= 4

m = 4-1

m = 3