Question

-x + 4y = 9 2x - 4X = -6

Answer 1

se for assim  2x - 4x = -6   ∴ -2x = -6   x(-1)  ∴ x = 6/2= 3

-x +  4y = 9   -3 +  4y = 9  ∴  4y = 9 + 3    y = 12/4= 3
  valor de  x= 3    e     y = 3