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2 n + m =18
2 (6) + 6 = 18
12 + 6 = 18
3 n - m = 12
3 (6) - 6 = 12
18 - 6 = 12
Y es el segundo
Solución:
2x+y=18
3x-y=12
__________
5x =30
x=30÷5
x=6
Reemplazando:
2[6]+y=18
12+y=18
12-18=y
6=y
3[6]-6=12
18-6=12
12=12