Explicación paso a paso:
X+y=120
2x+y=233
X+y=120(-2)
-2x-2y=-240
-y=-7
Y=7
X+7=120
X=120-7
X=117
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Verified answer
Explicación paso a paso:
X+y=120
2x+y=233
X+y=120(-2)
2x+y=233
-2x-2y=-240
2x+y=233
-y=-7
Y=7
X+7=120
X=120-7
X=117