# the work of a student to solve a set of equations is shown: equation a: y = 4 – 2z equation b: 6y = 2 – 4z step 1: –6(y) = –6(4 – 2z) [equation a is multiplied by –6.] 6y = 2 – 4z [equation b] step 2: 6y = 4 – 2z [equation a in step 1 is simplified.] 6y = 2 – 4z [equation b] step 3: 0 = 6 – 6z [equations in step 2 are added.] step 4: 6z = 6 step 5: z = 1 in which step did the student first make an error? step 4 step 3 step 2 step 1

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