The work of a student to solve a set of equations is shown:
Equation 1: m = 8 + 2n
Equation 2: 3m = 4 + 4n
Step 1: - 3 (m) = - 3 (8 + 2n) [Equation 1 is multiplied by - 3.]
3m = 4 + 4n [Equation 2]
Step 2: - 3m = - 24 - 6n [Equation 1 in Step 1 is simplified.]
3m = 4 + 4n [Equation 2]
Step 3: - 3m + 3m = - 24 - 6n + 4n [Equations in Step 2 are added.]
Step 4: 0 = - 24 - 2n
Step 5: n = - 12
In which step did the student first make an error?
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