Question

The steps below show the incomplete solution to find the value of y for the equation 4y − 2y − 4 = −1 + 13:

Answer 1

2y=16, because 2y-4=12
                              +4=+4
                          2y=16

Answer 2

2y=16. This is because
2y-4=12
2y=12+4
2y=16