The work of a student to solve a set of equations is shown below:

Equation 1: x + 2y = 10

Equation 2: 2x + 5y = 15

Step 1: –2(x + 2y) = –2(10)

2x + 5y = 15

Step 2: –2x – 4y = –10

2x + 5y = 15

Step 3: 1y = 5

Step 4: x + 2(1) = 10

Step 5: x = 8

In which step did the student first make an error? (4 points)

Step 1

Step 2

Step 3

Step 4