Humildetranquil659viz
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Solve the following systems of equations by elimination:
x + y = 7
-3x + 3y = -9

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Mlcparra16viz
x + y = 7 ... [1]
-3x + 3y = -9 ... [2]

3[1] + [2]
3x + 3y = 21
-3x + 3y = -9
      6y = 12
       y = 2

x + y = 7
x + 2 = 7
x = 5

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