1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
slava [35]
3 years ago
7

Solve the following system : -x + 5y = 8 and 3x + 7y = -2

Mathematics
1 answer:
poizon [28]3 years ago
4 0

-x + 5y = 8

multiply this equation by 3

-3x + 15y = 24

now add it to the other equation  ( elimination)

-3x + 15y = 24

3x + 7y = -2

-----------------------

0x  + 22 y = 22

divide each side by 22

y =1


substitute into -x + 5y =8  to find x

-x + 5(1) = 8

-x + 5 = 8

-x =3

divide by -1

x =-3

Answer (-3,1)

Choice A


You might be interested in
Please help me on this will give you brainliest
Ksju [112]

Answer:

I think it is 8.2

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
The standard deviation of the distribution of sample means is​ _______.
luda_lava [24]

Answer:

Standard error

Step-by-step explanation:

The standard deviation of the distribution of sample means is called the standard error of the means.

It is denoted by: \sigma_{\bar X}

The standard error is calculated using the formula: \sigma_{\bar X}=\frac{\sigma}{\sqrt{n} }

where n is the sample size and \sigma is the population standard deviation.

6 0
3 years ago
Which of the following is not a way to determine if a relation is a function?
Dima020 [189]

D. Determine if the relations’ graph forms a line.

Step-by-step explanation:

A function is a relation if the input values lead to only one output value.The input values, normally x values make up the domain, where as the output values form the domain.A function is a relation where the input values are associated with a single output.The vertical test is used to determine if a curve is a function.The line graph should only hit a single point on the curve.

Learn More

Relations and Functions :brainly.com/question/3296514

Keywords; relation, a function, vertical line test, output, input, maps

#LearnwithBrainly

8 0
3 years ago
The formula for the area A of a rectangle with length l and width w is A = l ⋅ w . Find A if: l = 23 feet and w = 15 feet The ar
dexar [7]

Answer:

345 sq. ft

Step-by-step explanation:

You know that the area is the length times the width. Simply plug in values to your equation:

A = l * w

A = 23 * 15

A = 345

The area is 345 square feet.

3 0
4 years ago
What is the base 8 representation of the number 11100111(2)
kondor19780726 [428]

Remark

You could convert base two to base 10 and then convert base 10 to base 8. That's the long way. The procedure below is the short way.

Step One

Write the base 2 number in groups of 3 starting from the right and going left

11 100 111

Step Two

Convert the base 2 numbers in groups of 3 to base 8. The largest result will be a 7

11 = 2*1 + 1 = 2 + 1 = 3

100 = 1*2^2 = 4

111 = 1*2^2 + 1*2 + 1 = 7

Step Three

Read the answer going down.

347 is the answer

Answer

347(8) = C


5 0
3 years ago
Other questions:
  • still bought a t-shirt for $21 and a pair of shorts for $16 he paid with 20 bills how much money did Dale get back
    7·1 answer
  • Grandma usually puts 6 cookies into each of 13 containers when she cooks a single batch. However, she now only has 6 containers.
    6·1 answer
  • Explain how to subtract two integers in your own words
    13·1 answer
  • Which exppression can be used to find 80% of 120
    7·2 answers
  • What is 3 ÷ 2/5? The quotient is 7 and _____<br><br><br><br> HELP PLEASE
    11·2 answers
  • EEEEEEEEEEEEEEEEEEEEEEEEEEE
    7·2 answers
  • Please help me with this question. The answer is $745,000 but I need working out.
    9·1 answer
  • Which of these products is positive? Select all that apply. -0.2 # (12.5) - 1 12 # ( -61 2) 3.2 # ( - 1 900) -31 2 # 0 -4.7
    13·1 answer
  • WILL GIVE BRAINLIEST IF ANSWER. PLEASE HELP ITS A 6TH GRADER QUESTION
    14·2 answers
  • Rewrite 7^5/7 with a single positive exponent
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!