Question

sistema x+2y=1 2x-y/3=5/4

Answer 1

  x + 2y = 1

2x - y/3 = 5/4  (6)

   x + 2y = 1

12x  - 2y = 15/2

13x = 15/2

2.13x = 15

26x = 15

   x = 15/26

   x + 2y =  1

  15/26 + 2y = 1

  2y = 1 - 15/26

  2y = 26/26 -15/26 = 11/26

    y = 11/26 : 2

    y = 11/26 . 1/2 y = 11/52

S = { 15/26, 11/52}

ufa!!!!