Mathematics, 17.07.2019 16:00 NREYESLDS2806
The work of a student to solve a set of equations is shown: equation a: y = 16 β 2z equation b: 7y = 2 β 4z step 1: β7(y) = β7(16 β 2z) [equation a is multiplied by β7.] 7y = 2 β 4z [equation b] step 2: β7y = 16 β 2z [equation a in step 1 is simplified.] 7y = 2 β 4z [equation b] step 3: 0 = 18 β 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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The work of a student to solve a set of equations is shown: equation a: y = 16 β 2z equation b: 7...
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