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
Artemon [7]
3 years ago
9

Slove by using elimination 3x+7y=27 -3x+y=21

Mathematics
1 answer:
tankabanditka [31]3 years ago
8 0

Answer:

x = -5

y = 6

Step-by-step explanation:

3x + 7y = 27      --------------(I)

-3x + y = 21        -----------(II)

Add equation (I) & (II) and so x will be eliminated and we can find the value of y.

(I)      3x + 7y = 27    

(II)    <u> -3x + y = 21  </u>      {add}

                8y = 48

                   y = 48/8

                   y = 6

Plugin y = 6 in equation (I)

3x +7*6 = 27

3x + 42 = 27

       3x = 27 - 42

       3x = -15

         x = -15/3

x = -5

You might be interested in
Which set of ordered pairs do NOT represent a function?
Rainbow [258]

Answer:

Every input can have only one output. But an output can have multiple inputs. Basically an x coordinate can have the same y coordinate as another ordered pair but not the same x coordinate. This is why d) does not represent a function.

Step-by-step explanation:

(4,-2)

(4,2)

4 is mentioned twice and every input( x value) can have only one output ( y-value)

7 0
3 years ago
Aaron needs 24 inches of copper wire for an experiment. The wire is sold by the centimeter. Given that 1 inch = 2.54 centimeters
tatiyna

\frac{1}{2.54} =\frac{24}{x}

Multiply both sides by 2.54.

1=\frac{24}{x} (2.54)

= \frac{60.96}{x}

Multiply both sides by x.

x = 60.96

Hence, Aaron needs 60.96 centimeters of wire.

8 0
3 years ago
Can anyone help with this?
Mademuasel [1]

Answer:

error

Step-by-step explanation:

8 0
4 years ago
5 7/12 - 1 3/4 = ? PLZ help me
Dafna1 [17]

Answer is 23/6 or 3 5/6

7 0
3 years ago
Imma keep on saying this I understand some of it but not all againnnn I’m sorryyy
Mariulka [41]

Answer:

6) The answer is 210p - 105

7) The answer is  -124q + 216

Step-by-step explanation:

1. Always Distributive Property first

6) -14 (8 - 15p)           7) -12 ( -18 + 10q)

    -112 +210p                 216 -120q

2. Combine like terms

6) -112  +  7  = -105   your full answer is 210p -105

7) -120q +   -4q  =  -124q  Your full answer is -124q +216.

Hope this helps.

6 0
3 years ago
Other questions:
  • Which describes how to calculate the range of this data set?
    5·2 answers
  • Which of the following is not a solution to the equation - 2x + 3y=9.
    10·1 answer
  • Please help<br> Thank you
    10·1 answer
  • Which graph shows a system with an infinite number of solutions?
    8·1 answer
  • 9) Which situation can be represented by the equation 56 - 2x
    12·2 answers
  • Solve the following expression when<br> t = 6 and d = 8<br> t + d = 8 - 6
    12·1 answer
  • A straight has slope equals to 12 and y-intercept equals to -5. What's the equation for this straight line?
    8·1 answer
  • REAL ANSWERS TROLL ANSWERS GET REPORTED Create your own graphic organizer that compares and contrasts the Industrial Revolution
    12·1 answer
  • Penny buys 3 bouquets of flowers for $3 each and 4 bouquets for $2 each. Which expression gives the total cost of the bouquets t
    8·2 answers
  • 5/8=X/28 Find the value of x in the following proportions.
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!