Respuesta :

m - n = 3
m = 3 + n

Substitute this value of m in equation 1,
3 + n + n = 5
2n = 5 - 3
n = 2 /2
n = 1

Substitute the value of n in equation 2, 
m - 1 = 3
m = 3 + 1= 4

In short, Your Answers are m = 4 and n = 1

Hope this helps!