Question

Me ajudeem????
2(x-1)+y=7
x+3y=2


y=3x
x+4y=26

Answer 1

2(x -1) + y = 7
2x - 2 + y = 7
2x +  y = 7 + 2
2x + y = 9


2x  +    y = 9
  x  + 3y  = 2 .(-2)

  2x +   y  =   9
- 2x  - 6y  = - 4
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      -  5y =  5 .(-1)
         5y = - 5
           y = - 5/5
           y = - 1

x + 3y = 2
x + 3.(-1) = 2
x - 3 = 2
x = 2 + 3
x = 5                     S = {( 5, -1)}
========================================
y = 3x
x + 4y = 26

x + 4y = 26
x + 4 . 3x = 26
x + 12x = 26
    13x = 26
       x = 26/13
       x = 2

y = 3x
y = 3 . 2
y = 6             S = {(2, 6)}