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

a) x – 3(6y – 15) = –3

b)x – 3(–6y – 15) = –3

c) (6y – 15) – 3y = –3

d) (–6y – 15) – 3y = –3

Answer 1

1) Solve for x in the first equation.
2) Substitute that new expression for x into the 2nd equation. Solve for y.
3) Substitute value for y into either equation, solve for x.
4) Check your answer

Answer 2

x=6y-15
(6y-15)-3y=-3