Question

A system of equations is given below:

y = 4x − 3
2x + 7y = 41

Which of the following steps could be used to solve by substitution?
A. 2(y = 4x − 3) + 7y = 41

B. 4x − 3 = 2x + 7y

C. 2x + 7(4x − 3) = 41

D. 2(y = 4x − 3)

Answer 1

C

The first equation gives you y=4x-3

Substituting this in for the y in the second equation 2x+7y=41 gives you 2x+7(4x-3)=41

Answer 2

Thank you so much!