2 years ago

Solve the system below, choose the x and y answers from the list below.

Mathematics

1 answer:

Bumek [7]2 years ago

5 0

Answer:

y=2, x=-1

Step-by-step explanation:

We can add the two equations together to eliminate x:

6x+5y+(-6x)+7y=4+20

12y=24

y=2

We plug y into the first equation and get

6x+5(2)=4

6x+10=4

6x=-6

x=-1

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3 years ago

The mean score on a driving exam for a group of driver's education students is 84 points, with a standard deviation of 4 points.

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Using Chebyshev's Theorem, it is found that:

At least 75% of the exam scores fall between 76 and 92.

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Chebyshev's Theorem states that the percentage of measures within k standard deviations of the mean is of at least $100(1 - \frac{1}{k^{2}})$ .

With k = 2, that is, within 2 standard deviations of the mean:

$P = 100(1 - \frac{1}{2^{2}})$

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A similar problem is given at brainly.com/question/23612895

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