The work of a student to solve a set of equations is shown:
Equation A: y = 15 - 2z
Equation B: 3y = 3 - 4z
Step 1: - 3 (y) = - 3 (15 - 2z) [Equation A is multiplied by - 3.]
3y = 3 - 4z [Equation B]
Step 2: - 3y = 15 - 2z [Equation A in Step 1 is simplified.]
3y = 3 - 4z [Equation B]
Step 3: 0 = 18 - 6z [Equations in Step 2 are added.]
Step 4: 6z = 18
Step 5: z = 3
In which step did the student first make an error
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