Question

2x1+6x2=18
5x1-4x2=25
qual o valor de x1 e x2 ?

Answer 1

 

2x1+6x2=18 (4)
5x1-4x2=25  (6)

 

 

     8x1  + 24x2 = 72

  30x1   -  24x2  = 150

             38x1 = 222

 

 x1  = 222/38

 

 

2x1+6x2=18  => 2(222/38)  + 6x2  = 18   => 444/38 + 6x2 = 18       mmc = 38

 

 

444 + 228x2  = 684  => 228x2 = 684 - 444 => 228x2 = 240 => x2 = 240/228 => x2 = 40/38