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
Morgarella [4.7K]
3 years ago
14

Using the linear combination method, what is the solution to the system of linear equations 7x-2y=-20 and 9x+4y=-6 ?

Mathematics
2 answers:
Ratling [72]3 years ago
7 0

Answer:

The answer would be well, B.(-2,3)

AleksandrR [38]3 years ago
4 0

Answer:

(x, y ) = (- 2, 3 )

Step-by-step explanation:

given the 2 equations

7x - 2y = - 20 → (1)

9x + 4y = - 6 → (2)

multiply (1) by 2 making the coefficients of y equal and opposite

14x - 4y = - 40 → (3)

add (2) and (3) term by term

(9x + 14x ) + (4y - 4y ) = (- 6 - 40 )

23x = - 46 ( divide both sides by 23 )

x = - 2

substitute x = - 2 into either (1) or (2) for y

(2) - 18 + 4y = - 6 ( add 18 to both sides )

4y = 12 ( divide both sides by 4 )

y = 3

solution is (- 2, 3 )


You might be interested in
Jamie has an old CD that she wants to use for an art project. The circumstance of the CD is 22 cm and she would like to cut from
nirvana33 [79]

Answer: 10 cm


Step-by-step explanation:

The circumference of the CD = 22\pi


We know that the formula of the circumference is:


Circumference = 2\pi r


We will substitute the value of circumference to find the radius:


22 pi = 2 x pi x r


r = 11


Therefore its radius will be 22 / 2 = 11 cm


Jamie wants to cut the CD from the middle of the CD to one side but leaving one cm. To find the measurement of the cut portion, we will subtract 1 from 11 to get:


11 - 1 = 10 cm

8 0
4 years ago
In one area, the cable company marked up the
butalik [34]

Cable company marked up monthly cost by 6% .New cost = $63.6

cost before increase = 63.6 × 100/106

= $60

7 0
3 years ago
For this exponential function what is the output value (y) when the input value (x) is 0?
Alenkinab [10]

Answer:

12

Step-by-step explanation:

y^0=1\\5^0=1\\12*1=12

6 0
3 years ago
What is the measure of ∠B?
DochEvi [55]
M<B = 90 - 38
m<B = 52
answer is B. 52
8 0
3 years ago
One side of a triangle is 2 times the second side. The third side is 15 feet longer than the second side. The perimeter of a
ch4aika [34]

Answer:

16, 8, 23

Step-by-step explanation:

2x+x+x+15=47

4x+15=47

4x=32

x=8

2x=16

x+15=23

7 0
3 years ago
Other questions:
  • sheilas cell phone plan consists of a monthly rate and a fee for each minute she talks over 500 minutes per month. Her july bill
    7·1 answer
  • Can someone help..? thanks ​
    15·1 answer
  • How long will it take you to triple an amount of 500 of you invest it at of 6% compounded annually? Applications of logs
    15·1 answer
  • Which of the following statements is sufficient to prove that BUGS is a parallelogram
    10·2 answers
  • What type of graph is best to use to organize numerical data based on their digits to compare value? A. Venn diagram B. box and
    7·2 answers
  • Evaluate the following expression 2(1,0) -3(2,-1)<br> A-(2,3)<br> B-(-4,3)<br> C-(-3,-2)<br> D-(2,3)
    15·2 answers
  • WHOEVER ANSWERS THIS CORRECTLY I'LL GIVE BRAINLIEST!!!!!!!!!!!!
    6·2 answers
  • The largest negative integer is -1000​
    15·1 answer
  • HURRY!!!!
    9·1 answer
  • A teacher has 36 students who are sitting in 6 rows of 6 desks. He wants to survey the students about the homework policy. Which
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!