Question

ajudem ae galera x+y=15 x-y=7

Answer 1

x + y = 15
x - y = 7
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2x + 0 = 22
2x = 22
  x = 22/2
  x = 11
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x + y = 15
11 + y = 15
y = 15 - 11
y = 4
Solução x = 11 e y = 4

Answer 2

x+y=15
x-y=7
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2x=22
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x=22/2
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x=11
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y=15-11
y=4
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x=11
y=4