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mezya [45]
3 years ago
5

What is the value of x for the solution to this system of equations

Mathematics
1 answer:
Goshia [24]3 years ago
5 0

Answer:

The correct answer is A) -3

Step-by-step explanation:

To solve this system of equations, take what y is equal to in the first equation and input it for y in the second equation.

7x + 4y = -1

7x + 4(-x + 2) = -1

Now solve for x.

7x + 4(-x + 2) = -1

7x -4x + 8 = -1

3x + 8 = -1

3x = -9

x = -3

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12+2y=2+5y PLEASE HELP MEEE
CaHeK987 [17]

Answer:

y=\frac{10}{3}

Step-by-step explanation:

12+2y=2+5y

12-2=5y-2y

10=3y

\frac{10}{3} =y

7 0
3 years ago
A research company desires to know the mean consumption of meat per week among people over age 23. A sample of 164 people over a
Elan Coil [88]

Answer:

The 80% confidence interval for the mean consumption of meat among people over age 23 is between 4 and 4.2 pounds.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.8}{2} = 0.1

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.1 = 0.9, so z = 1.28

Now, find M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.28*\frac{0.7}{\sqrt{164}} = 0.07

The lower end of the interval is the mean subtracted by M. So it is 4.1 - 0.07 = 4.03 pounds

The upper end of the interval is the mean added to M. So it is 4.1 + 0.07 = 4.17 pounds

Rounded to one decimal place

The 80% confidence interval for the mean consumption of meat among people over age 23 is between 4 and 4.2 pounds.

8 0
3 years ago
3⋅ 3/5 (3/5 is a fraction)
LUCKY_DIMON [66]
Well its a simplest form of zero and 6 tenths and if u divide it by 2 youll get 3/5 as a fraction
6 0
3 years ago
What is the value of the expression below when z=7 6z-2
horsena [70]

Answer:

the answer is 40

Step-by-step explanation:

U multiply then subtract.

6 0
2 years ago
Fill in the missing numbers to find two equivalent fractions 4/5 please help !!
konstantin123 [22]
First fill in the blank box is 2 second is 8 third is 80
7 0
2 years ago
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