Respuesta:
11)
(-1) 2x-y=9
2x+7y=17
entonces
-2x+y=-9
2x +7y=17
0 + 8y=8
y= 1
reemplazo
2x+7(1)=17
2x=17-7
2x=10
x=5
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Verified answer
Respuesta:
11)
(-1) 2x-y=9
2x+7y=17
entonces
-2x+y=-9
2x +7y=17
0 + 8y=8
y= 1
reemplazo
2x+7(1)=17
2x=17-7
2x=10
x=5