Equation A Y = x + 1

Equation B Y = 4x + 5
Which of the following steps can be used to find the solution to the set of equations?
X + 1 = 4x + 5
X + 1 = 4x
X = 4x + 5
X + 5 = 4x + 1

The correct step to be used to find the solution to the set of equations is:

X + 1 = 4x + 5