Choose the equations below that represent correct steps in solving this system of equations using substitution.
x + 3y =9 y= x - 5
x + 3 (x - 5) =9
x + 3x - 15 =9
(x - 5) + 3y =9
4x - 15 =9
2x + 4y =9 - 5
x + 3 (x - 5) =9
x + 3x - 15 =9
4x - 15 =9