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

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

Answer 1

x - 6y = -15
add 6y on both sides, what u get ?

Answer 2

is it x - 3(-6y - 15) = -3?

Answer 3

huh ? no.
please add 6y to both sides of x - 6y = -15
and tell me what u get?

Answer 4

x = 6y - 15

Answer 5

that is correct!
now put that in 2nd equation x - 3y = -3, what u get ?

Answer 6

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

Answer 7

absolutely correct.
did u understand ?

Answer 8

yes! thank you so much!

Answer 9

welcome ^_^