kikikikitty23
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Margie's work for adding linear expressions is shown below. After checking her answer with the answer key, she solved it incorrectly.
Given (−2.67b + 11) − (5.38b − 15)
Step 1 −2.67b + 11 + (−5.38b) + 15
Step 2 −2.67b + 5.38b + 11 + 15
Step 3 (−2.67b + 5.38b) + (11 + 15)
Step 4 2.71b + 26


Part A: Identify and explain the first step where Margie made an error. (2 points)

Part B: Explain how to correctly write the expression in fewest terms by correcting the error in Part A. Show all work. (2 points)

Respuesta :

chibabykalu16

Step-by-step explanation:

Part A She made an error in step 4 when calculate it

Part B

−2.67b+11−(5.38b−15)

Distribute the Negative Sign:

=−2.67b+11+−1(5.38b−15)

=−2.67b+11+−1(5.38b)+(−1)(−15)

=−2.67b+11+−5.38b+15

Combine Like Terms:

=−2.67b+11+−5.38b+15

=(−2.67b+−5.38b)+(11+15)

=−8.05b+26

Answer: The answer for part A is that in Step 2 she forgot to put the negative sign for 5.38b so the equation for step 2 should be -2.67b-5.38b+11-15 (She also forgot to put the minus symbol for 15). And for part B here is how to write the equation correctly (-2.67b+11)-(5.38b-15) then -2.67b+11+(-5.38b)-15, -2.67b-5.38b+11-15,(-2.67b-5.38b)+(11-15), and -8.07b-4.

Step-by-step explanation: I did the work on paper and looked at the equation to see what she did wrong and then I solved like it the and for part B I copied the steps she had right and fixed the ones she did wrong

Hope this Helps :D

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