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Solve the systems of linear equations by any method, if there is a solution.

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        11.    y =  x + 4
               y = 2x + 6                          ______________________







        12.    10x + 8y = 2
               5x + 4y = 1                         ______________________







        13.    2x + 18y = -9
               4x + 18y = -27                      ______________________







        14.    y = x + 2
               2x + y = 3                          _______________________







        15.    2x + 4y = -12
                    x + 2y = 6              _______________________
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