A system of equations is given below:

y = –2x + 1
6x + 2y = 22

Which of the following steps could be used to solve by substitution?

A. 6x + 2(−2x + 1) = 22
B. −2x + 1 = 6x + 2y
C. 6(−2x + 1) + 2y = 22
D. 6(y = −2x + 1)

Question

A system of equations is given below: 

y = –2x + 1 
6x + 2y = 22 

Which of the following steps could be used to solve by substitution?

A. 6x + 2(−2x + 1) = 22
B. −2x + 1 = 6x + 2y
C. 6(−2x + 1) + 2y = 22
D. 6(y = −2x + 1)

pooja195 · Answer

Use substitution

k_lynn · Answer

Since the first equation says that y=-2x+1, then shouldn't you be able to substitute -2x+1 in for y in the second equation?  
That would be what pooja said.  Substitution.