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1) (x+y=10)2
2)(2x+4y=26)-1
suma 1y 2
1)2x+2y=20
2)-2x-4y=-26
-2y=-6
y=-6/-2
y=3
sustituye y en 1
1)x+y=10
x+3=10
x=10-3
x=7
comprobacion
1)x+y=10
7+3=10
10=10
2)2x+4y=26
2(7)+4(3)=26
14+12=26
26=26