Consider the following set of equations:

Equation M: y = x + 8
Equation P: y = 3x + 6

Which of the following is a step that can be used to find the solution to the set of equations? (4 points)

a
x = 3x + 6

b
x + 8 = 3x + 6

c
x + 6 = 3x + 8

d
x = 3x