Question

Calcule os sistemas lineares a) ×-y=2 ×+y=6 b) 2×-y=3 -2×+4y=5 c) -×+2y=7 ×+2y=9 ​

Answer 1

Assunto: sistemas.

a) x - y = 2

    x + y = 6

    2x = 8

    x = 4

   4 - y = 2

   y = 2

   S = ( 4 , 2 )

b) 2x - y = 3

   -2x + 4y = 5

    3y = 8

    y = 8/3

   2x = 9/3 + 8/3 = 17/3

   x = 17/6

   S = ( 17/8 , 8/3 )

c) -x + 2y = 7

     x + 2y = 9 ​

    4y = 16

    y = 4

   x + 8 = 9

  x = 1

  S = ( 1 , 4 )