Question

encontre o valor de x e y dos sistemas
a)X+4Y=0
3X+2Y=5

Answer 1

x + 4y = 0
x = - 4y

3x + 2y = 5
3 ( - 4y ) + 2y = 5
- 12y + 2y = 5
- 10y = 5 ( - 1 )
  10y = - 5
     y = - 5/10
     y = - 1/2

x + 4y = 0
x + 4( - 1/2 ) = 0
x - 4/2 = 0
x - 2 = 0
x = 2