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
bixtya [17]
3 years ago
11

He simultaneous equations5x + y = 21x - 3y = 9 With working out​

Mathematics
1 answer:
Elza [17]3 years ago
8 0

Answer:

see explanation

Step-by-step explanation:

Given the 2 equations

5x + y = 21 → (1)

x - 3y = 9 → (2)

Multiply (1) by 3 and add the result to (2) to eliminate y term

15x + 3y = 63 → (3)

Add (2) and (3) term by term

(x + 15x) + )- 3y + 3y) = (9 + 63)

16x = 72 ( divide both sides by 16 )

x = 4.5

Substitute x = 4.5 into (1) for corresponding value of y

22.5 + y = 21 ( subtract 22.5 from both sides )

y = - 1.5

Solution is (4.5, - 1.5 )

You might be interested in
Find the value of x<br><br> 3(x-4)
antoniya [11.8K]
3x-12 is simplified from parenthesis
7 0
3 years ago
Find the distance between -6 - 8
Viefleur [7K]

Answer:

2

Number line.

We start at -6 or -8.

If we start from -6, we will be going __ spaces to the left until we get to -8.

Or start from -8 and go __ spaces to the right until you get to -6.

Then count the spaces.

You'll get 2.

4 0
2 years ago
Read 2 more answers
How do you simplify the following
Fed [463]
It is 2i I standing for imaginary since it is a negative

square root of -1×4

4 square rooted is 2

and a negative number square rooted is i
8 0
3 years ago
Show the reflection of the given points.Locate the points of the reflection in their proper position around the x-axis
amid [387]

Answer: I believe this is it

4 0
2 years ago
The length of a desk is 3.5 feet. How many centimeters is the length? (There are 2.54 cm in an inch)
gregori [183]

Answer:106.

Step-by-step explanation:

5 0
3 years ago
Other questions:
  • Naomi and Claire are painting a mural. Naomi paints 2 square feet per hour and has already painted 16.5 square feet.
    6·1 answer
  • **YOU WILL GET A THANKS, 11 POINTS, INCLUDING A HAPPY STUDENT**
    8·2 answers
  • 5x + 16 = 9x-4 plz solve
    9·2 answers
  • Find the real-number root.001O no real rootsO 0.1O 0.1 and 0.1O 0.1 I need help
    5·2 answers
  • 3.1 x 10^-4 x 8.5 x 10^-2
    6·2 answers
  • September 6 is a Read Book Day.Polina read 5 times as many pages as Marcus read.Together,the read 108 pages.How many pages did e
    14·1 answer
  • What is the equation of a circle with center (-4,7) and radius 8?
    13·1 answer
  • Need help with math 25 points and brainlest correct answers only
    12·2 answers
  • The Wilson family was one of the first to come to the U.S. They had 8 children. Assuming that the
    12·1 answer
  • Find the X and Y intercepts and graph the line. Your X and Y must be written as a point. show work plz asap help
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!