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
Olegator [25]
2 years ago
14

PLEASE I NEED HELP RN use the elimination method to solve. -7x+y=-19 -2x+3y=-19

Mathematics
1 answer:
-BARSIC- [3]2 years ago
8 0

Answer:

  (x, y) = (2, -5)

Step-by-step explanation:

The coefficient of y in the second equation is an integer multiple of the coefficient in the first equation, so it is convenient to eliminate y. Subtracting 3 times the first equation from the second, we have ...

  (-2x +3y) -3(-7x +y) = (-19) -3(-19)

  -2x +3y +21x -3y = -19 +57 . . . . . . . eliminate parentheses

  19x = 38 . . . . . . . . . simplify

  x = 2 . . . . . . . divide by 19

  -7(2) +y = -19 . . . . . substitute for x in the first equation

  y = -5 . . . . . . add 14

The solution is (x, y) = (2, -5).

You might be interested in
Can someone answer pleaseee!
Scilla [17]

Answer:

The answer would be D

Step-by-step explanation:

It is a Pentagon it has 5 sides and the discription said I had 4 sides

4 0
3 years ago
Help plssssssssssssssssss
xxTIMURxx [149]

Answer:

I believe is 3 4/6

Step-by-step explanation:

22/5  : 6/5

22/5 * 5/6

22/6

11/3

3 4/6

7 0
3 years ago
Read 2 more answers
(6 - 1) + (3m)i = -12 + 27i
Yanka [14]

Answer:

We want to solve the equation:

(6 - 1) + (3m)i = -12 + 27i

Where m is a complex number.

first, we can rewrite this as:

5 + 3*m*i = -12 + 27*i

3*m*i = -12 - 5 + 27*i

3*m*i = -17 + 27*i

And we can write m as:

m = a + b*i

Replacing that in the above equation we get:

3*(a + b*i)*i = -17 + 27*i

3*a*i + 3*b*i^2 = -17 + 27*i

and we know that i^2 = -1

3*a*i - 3*b = -17 + 27*i

The real part in the left (-3*b) must be equal to the real part in the right (-17)

then:

-3*b = -17

b = -17/-3 = 17/3

And the imaginary part in the left (3*a) must be equal to the imaginary part in the right (27)

then:

3*a = 27

a = 27/3.

Then the value of m is:

m = a + b*i = (27/3)  + (17/3)*i

8 0
3 years ago
Can you Help me? With B
coldgirl [10]
She would need to buy 10 additional bags.
4 0
3 years ago
You found the prime factorization of the number 72. Explain how you can check your answer.
ch4aika [34]

To find out whether a prime factorization is correct, verify that all the factors are indeed prime. Then multiply the factors. The product should equal 72.

5 0
3 years ago
Other questions:
  • Solve 9x−y=45 for y.
    8·1 answer
  • Angela made the trip by bus in 20 hours and the return trip by car in 16 hours. the bus traveled 8 miles per hour slower than th
    5·1 answer
  • Solving system of equations by substitution
    13·1 answer
  • (- 3X2-5)<br>ICOMPLITE FOR THE ANSWER?​
    12·1 answer
  • Is this answer right?
    5·2 answers
  • HELP PLZ
    11·1 answer
  • What is 13/14 - 1/4 and put it in simplest
    10·2 answers
  • Find the value of x.<br> X<br> 5x - 9<br> 3x + 15
    10·1 answer
  • Kelly runs a distance of 100 metres in a time of 10.52 seconds.
    15·1 answer
  • If a =2, find 4a + 18
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!