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Solve the following systems by elimination: x + y = 7
x – y = -3

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Mlcparra16viz
x + y = 7 ... [1]
x - y = -3 ... [2]

[1] + [2]
x + y = 7
x - y = -3
    2x = 4
      x = 2

Substitute the value of x to the first equation
x + y = 7
2 + y = 7
   y = 5