Can someone please help 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)