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
Dafna11 [192]
3 years ago
15

Solve the system by using elementary row operations on the equations. Follow the systematic elimination procedure.

Mathematics
1 answer:
Natali5045456 [20]3 years ago
4 0

Answer:

Step-by-step explanation:

The given equation is expressed as

x1 + 2x2 = -24- - - - - - - - --1

x1 + 7x2 = -11- - - - - - - --2

We would eliminate x1 by subtracting equation 2 from equation 1. It becomes

- 5x2 = - 13

Dividing both sides of the equation by - 5, it becomes

- 5x2/- 5 = - 13/- 5

x2 = 13/5

Substituting x2 = 13/5 into equation 2, it becomes

x1 + 7 × 13/5 = -11

x1 + 91/5 = - 11

x1 = - 11 - 91/5

x1 = - 146/5

You might be interested in
The width of a rectangle is 2x ^2 +9x -7 and length is x^2 -9
lesantik [10]

Answer:

63 - 81x - 25x² + 9x³ + 2x⁴

Step-by-step explanation:

Multiply the two polynomials to arrive at your answer I guess, since this was not specific enough.

I am joyous to assist you anytime.

7 0
3 years ago
Convert 19 over 2 to a decimal using long division.
vampirchik [111]
19/2 = 19 divided by 2 = 9.5

Hope this helped.
5 0
3 years ago
Read 2 more answers
What are the solutions of this system of equations?
SpyIntel [72]

Answer:

Option C is correct.

Step-by-step explanation:

y = x^2-x-3     eq(1)

y = -3x + 5      eq(2)

We can solve by substituting the value of y in eq(2) in the eq(1)

-3x+5 = x^2-x-3

x^2-x+3x-3-5=0

x^2+2x-8=0

Now factorizing the above equation

x^2+4x-2x-8=0

x(x+4)-2(x+4)=0

(x-2)(x+4)=0

(x-2)=0 and (x+4)=0

x=2 and x=-4

Now finding the value of y by placing value of x in the above eq(2)

put x =2

y = -3x + 5

y = -3(2) + 5

y = -6+5

y = -1

Now, put x = -4

y = -3x + 5

y = -3(-4) + 5

y = 12+5

y =17

so, when x=2, y =-1 and x=-4 y=17

(2,-1) and (-4,17) is the solution.

So, Option C is correct.

7 0
3 years ago
Read 2 more answers
Where are the black dots located?!!
Ludmilka [50]

-2, 2 and for the other 4,5

3 0
3 years ago
Read 2 more answers
Which shows a function that is decreasing<br>over its entire graph? Working on it now need ASAP ​
PtichkaEL [24]

One thing everyone always forgets is we don't usually see the <em>entire</em> graph.  Once out of the frame, these functions can do anything they want.

From what we can see, only the bottom right one is always decreasing.

Answer: bottom right

By the way, the top right graph (a vertical line) isn't a function.

7 0
3 years ago
Other questions:
  • If sin y° = 9 divided by c. and tan y° = 9 divided by d. ,what is the value of cos y°?
    15·2 answers
  • An experienced cashier at a grocery store takes 2 seconds to scan each item and 40 seconds to process the customer's payment. 1)
    14·1 answer
  • What is the y-intercept of this line?​
    9·2 answers
  • Determine whether the given description corresponds to an observational study or experiment
    6·1 answer
  • Probability
    13·1 answer
  • X/9 = 8<br><br> step to step
    8·1 answer
  • Daniels mom started a college savings account for him when he was born.she opened the account with $5 and planned to deposit $10
    12·1 answer
  • North carolina has 12 less electoral votes than florida. Write and solve a subtraction equation if the total number of votes for
    11·1 answer
  • A carpenter’s sketch of a room does not include a scale. She measures a wall that has been built and finds that it is 38.5 ft. l
    7·1 answer
  • Subtract 4 3/4 - ( -1 1/12 ) Enter your answer as a simplified mixed number by filling in the boxes
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!