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