Question

usando o método da adição,resolva os sistemas abaixo e verifique a solução encontrada.

A) 4x+y=7
2x-5y=9
B)4x+3y=14
5x-2y=29

Answer 1

Resposta:

A) 4x+y=7

    2x-5y=9(-2)

    

    4x+y=7                               4x+y=7

   -4x+10y=-18                        4x+(-1)=7

    11y=-11                              4x-1=7

    y=-11/11                             4x=7+1

    y=-1                                     4x=8

                                                 x=8/4=2

b) 4x+3y=14*(5)

    5x-2y=29*(-4)

                                                       4x+3y=14

    20x+15y=70                               4x+3(-2)=14

   -20x+8y=-116                              4x-6=14

    23y=-46                                      4x=14+6

     y=-46/23                                    4x=20

     y=-2                                            x=20/4

                                                        x=5