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?
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