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2014-08-20T13:34:13-03:00
4x+5y=41            4x+5y=41                           4x+5y=41
2x+4y=28(-2) = -4x-8y=-56                            4x+5.5=41
                                -3y= -15(-1)                     4x+25=41
                                     y=15/3                          4x=41-25
                                      y= 5                              4x=16
                                                                              x= 16/4
                                                                               x=4
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