The work of a student to solve a set of equations is shown:
equation a: y = 15 β 2z
e...
Mathematics, 30.08.2019 01:30 bigmouth804
The work of a student to solve a set of equations is shown:
equation a: y = 15 β 2z
equation b: 3y = 3 β 4z
step 1:
β3(y) = β3(15 β 2z) [equation a is multiplied by β3.]
3y = 3 β 4z [equation b]
step 2:
β3y = 15 β 2z [equation a in step 1 is simplified.]
3y = 3 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? (5 points)
step 4
step 3
step 2
step 1
Answers: 1
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