Question

Using substitution to solve the system x = 2y + 3 and 4x - 5y = 9, which of the following could be the first step?
Answer

x - 2y = 3
4x - 5y = 9

4(2y + 3) - 5y = 9

x + 2y = 4x - 5y

5x - 3y = 12

- 3x + 7y = -6

Answer 1

4(2y + 3) - 5y = 9

because we are substituting x into the second equation and that's what the question asks us to do

Answer 2

thanks!

Answer 3

anytime!