Can someone me? i don't understand this.
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? (4 points)
select one:
a. 6x + 2(–2x + 1) = 22
b. –2x + 1 = 6x + 2y
c. 6(–2x + 1) + 2y = 22
d. 6(y = –2x + 1)

Substitution is when you take the x (or y)  value in the first equation and insert it into the second equation, and solve for both values. 

y = –2x + 1
6x + 2y = 22

Now, given the y value (first equation), we can insert that into the SECOND equation. 

6x + 2(-2x + 1) = 22

the only choice that demonstrates the above equation is A) 

So, here's your answer ⇒ a. 6x + 2(–2x + 1) = 22 

Good luck with your assignment!