Ernesto tried to determine the solution for the system of equations using substitution. His work is shown below.


x – y = 7


3x – 2y = 8


Step 1: x = y + 7

Step 2: 3(y + 7) – 2y = 8

Step 3: 3y + 7 – 2y = 8

Step 4: y + 7 = 8

Step 5: y = 1


In which step did Ernesto make the first error?


Step 1

Step 2

Step 3

Step 4