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crimeas [40]
3 years ago
13

Breann solved the system of equations below. What mistake did she make in her work? 2x + y = 5 x − 2y = 10 y = 5 − 2x x − 2(5 −

2x) = 10 x − 10 + 4x = 10 5x − 10 = 10 5x = 20 x = 4 2(4) + y = 5 y = −3 (5 points) Select one: a. She should have substituted 5 + 2x b. She combined like terms incorrectly, it should have been 4x instead of 5x c. She subtracted 10 from both sides instead of adding 10 to both sides d. She made no mistake
Mathematics
1 answer:
goldfiish [28.3K]3 years ago
5 0

Answer:

No mistake

Step-by-step explanation:

2x + y = 5

x - 2y = 10

y = 5 - 2x

x - 2(5 - 2x) = 10

x - 10 + 4x = 10

5x - 10 = 10

5x = 20

x = 4

2(4) + y = 5

y =  -3

She made no mistake

You can check by plugging in x = 4 and y = -3 into the original equations . They fit exactly.


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Read 2 more answers
I’m struggling to answer this question on my test, can someone explain it to me?
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Correct answer is Option A: 18/48 = 21/56

You’ll have to divide the numerator by the denominator of each fraction to see whether they have the same quotient:

18/48 = 0.375
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The other options are not proportional.

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C). 3/5 = 13/10
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Hence, 3/5 ≠ 13/10

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Please mark my answers as the Briainliest if you find my explanations helpful :)
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