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m+ 2n = 13
se resta cada termino
3m + 0 = 9
m = 9/3
m= 3
4m+2n= 22 (se remplaza la m)
4(3) + 2n = 22
12+ 2n= 22
2n= 22-12
2n= 10
n= 10/1
n=5
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x+y=25
x=y+5
las hacemos equivalentes
x= 25-y
x=5 + y
los restamos
0 = 20 - 2y
-20= -2y
20=2y
20/2=y
10=y
x=25-y (se reemplaza la y)
x=25-10
x=15