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3 years ago

Use substitution to solve the system of equations.

Mathematics

1 answer:

kakasveta [241]3 years ago

4 0

Answer:

C (let me know if I am wrong!)

Step-by-step explanation:

We need to solve the equation.

If 5x+y = -24, then -24 - 5x = y.

x+ 3(-24-5x) = -2

= -14x-72=-2

= -14x-72+72=-2+72

= -14x=70

= -5

If x = -5, then -5 + 3y = -2.

3y = -2+5

3y = 3

y=1

So the answer is C.

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Carrie and Ryan have both computed the slope of the least-squares line using data for which the standard deviation of the x-valu

alexdok [17]

Answer:

Carrie's slope value is correct.

Step-by-step explanation:

The least square regression line is: $(y -\bar y)=b_{yx} (x-\bar x)$

Here $b_{yx}$ is the slope of the line.

The formula to compute the slope is:

$b_{yx}=r\frac{\sigma_{x}}{\sigma_{y}}$

Here $\sigma_{x}$ = standard deviation of x and $\sigma_{y}$ = standard deviation of y.

It is provided that the standard deviation of x and y are equal.

So the slope of the regression line is:

$b_{yx}=r\frac{\sigma_{x}}{\sigma_{y}}=r\frac{\sigma_{x}}{\sigma_{x}}=r$

Thus, if the standard deviation of x and y are equal the slope of the line is same as the correlation coefficient.

The correlation coefficient is a measure used to determine the strength of the linear relationship between the variables.

It ranges from -1 to 1.

Carrie's slope value was 0.50 and Ryan's slope value was 2.

Since -1 ≤ r ≤ 1 the value of slope cannot be 2.

Thus, Ryan's slope value is incorrect.

6 0

3 years ago

Question #6 I can't figure it out.

stepan [7]

6 x 9 = 54
I think the know facts are 18 and 36, because they are the only basic numbers 6 and 9 can go into.

6 0

3 years ago

Is 0 a complex, pure imaginary, and a nonreal complex number?

lisabon 2012 [21]

Answer:

Step-by-step explanation:

First, 0 doesn't have any i values, so 0 is not pure imaginary.

Also, 0 is indeed a real number, so it is not a "non-real complex number."

Therefore, the only option left is that 0 is a complex number, and 0 is indeed a complex number.

The answer is A.

7 0

3 years ago

Estimate the product of 7 and 3, 289

nikklg [1K]

33,000 If you round 3,289 up then in would be 3,300. And 7 rounded up would be 10. So 3,300 x 7 = 33,000

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2 years ago

A football player attempts to kick a football across a field. The path of the football can be modeled by the function h(x) = − 1

Neporo4naja [7]

Answer:

zsdgbvcdfgb

Step-by-step explanation:

8 0

3 years ago

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