Question

Se 2x+3y=5 e 5x+2y=7, quais os valores de x e de y?

Answer 1

2x+3y=5, x= 5-3y/2, 5( 5-3y)/2 + 2y= 7; 25-15y+4y=14. -11y= -11, y=1. Substitui y p/ achar x, 2x+3.1=5, x=1

Answer 2

  2x+3y=5 (-5)
  5x+2y=7 ( 2)

  -10x - 15y = - 25
   10x + 4y  =   14
          - 11y = - 11 (-1)
             11y = 11
               y = 1

 2x+3y=5 ==> 2x + 3.1 = 5 ==> 2x = 5-3 ==> 2x = 2 ==> x = 1