Question

2x+y=220
X-y=26
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Answer 1

2x+y=220       
x-y=26
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3x=246
x=246/3
x=82

2x+y=220
2.82+y=220
164+y=220
y=220-164
y=56

Substituindo os valores de x e y:
2x+y=220
2.82+56=220

x-y=26
82-56=26