Question

x+y=5
-2x+y=-1

me ajudem

Answer 1

  x + y = 5
-2x + y = -1

x + y = 5
x = 5 - y

- 2.(5 - y) + y = -1
- 10 + 2y + y = - 1
- 10 + 3y = - 1
  3y = - 1 + 10
  3y = 9
    y = 9/3
    y = 3

x + y = 5
x + 3 = 5
x = 5 - 3
x = 2