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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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A spinner has 10 equal sections numbered 1 through 10. What is the probability of
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Answer:

The correct answer is C. 1/10.

Step-by-step explanation:

Given that a spinner has 10 equal sections numbered 1 through 10, to determine what is the probability of landing on the 6, the following calculation must be performed:

6 = 1 side only

10 = 10 options

1/10 = X

Therefore, the probability of the spinner landing on the 6 is 1/10.

3 0
3 years ago
Find the discriminat of each quadratic equation then state the number and type of solutions
Julli [10]
Hello : 
the discriminat of each quadratic equation : ax²+bx+c=0 ....(a <span>≠ 0) is :
</span><span>Δ = b² -4ac
1 )  </span>Δ > 0  the equation has two reals solutions : x =  (-b±√Δ)/2a
2 ) Δ = 0 : one solution : x = -b/2a
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8 0
3 years ago
Given qr = 4.8, m angle r space equals space 80 degree , and m angle p equals 42 degree ... if you want to find pq.... a. should
Lady bird [3.3K]

By applying the law of sines, the length of side PQ is equal to 7.1 units.

<h3>What is the law of sines?</h3>

The law of sines is also referred to as sine law and it can be defined as an equation that relates the side lengths of a triangle to the sines of its angles.

<h3>How to calculate the length of PQ?</h3>

Mathematically, the law of sines is given by this equation:

\frac{sinA}{a} =\frac{sinB}{b} =\frac{sinC}{c}

Substituting the given parameters into the formula, we have;

\frac{sin80}{PQ} =\frac{sin42}{4.8} \\\\\frac{0.9848}{PQ} =\frac{0.6691}{4.8}\\\\0.6691PQ = 4.7270\\\\PQ = 4.7270/0.6691

PQ = 7.1 units.

Read more on law of sines here: brainly.com/question/7922954

#SPJ1

4 0
2 years ago
What is the value of the expression 9 × 2 + 2 × 5²
NARA [144]

9 \times 2 + 2 \times  {5}^{2}  \\  = 18 + 2 \times 25 \\  = 18 + 50 \\  = 68

6 0
2 years ago
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Sedbober [7]
I believe that the answer is 20. I am not entirely sure though.
7 0
3 years ago
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