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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

1 answer

x + 3 (x - 5) =9
x + 3x - 15 =9
4x - 15 =9
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