Question

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the first equation is substituted into the second equation.
x – 6y = –15
x – 3y = –3
Answer
(6y – 15) – 3y = –3

x – 3(–6y – 15) = –3

(–6y – 15) – 3y = –3

x – 3(6y – 15) = –3

Answer 1

First answer.

Answer 2

Heres why.

from first equation x=6y-15
substitute in second equation
(6y-15)-3y=-3