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

(6y – 15) – 3y = –3

Answer 2

x – 6y = –15
rearranging the first equation, we get
x = -15 + 6y or we can say x = 6y - 15

substituting x = 16y - 15 in second equation u get

(6y - 15) – 3y = –3