Solve the system of linear equations by elimination -x+y=4;x+3y=4

Answers

Answer 1

Answer:

the solution is (-8, 4)

Step-by-step explanation:

Let's use the addition/subtraction method here to eliminate one variable:

-x+y=4

x+3y=4

Combining these two equations results in

4y = 8, so that y = 2.  Substituting y = 2 into the second equation, we get:

x + 3(2) = 4, or x = -2.

Then the solution is (-8, 4)


Related Questions

Plz show your work.

Answers

Answer:

look at the picture i sent.......

The ratio is 2:5 red beads to blue beads. If you have a TOTAL of 21 beads, how many are red, and how many are blue beads?

Answers

Answer:

Number of red beads = 6

Number of blue beads = 15

Step-by-step explanation:

Number of total beads = 21

Ratio of red beads to the blue beads = 2 : 5

Therefore, number of red beads I have = [tex]\frac{2}{2+5}(\text{Total number of beads})[/tex]

                                                                  = [tex]\frac{2}{7}\times 21[/tex]

                                                                  = 6 beads

Number of blue beads = [tex]\frac{5}{2+5}\times (21)[/tex]

                                      = [tex]\frac{5}{7}\times 21[/tex]

                                      = 15 beads

Therefore, number of red beads = 6

And number of blue beads = 15

       

The radius of a circle is 4 feet. What is the circle’s area?

Use 3.14 for pi

Answers

Answer:

A= 3.14 * 4² = 50.24 ≈ 50 ft²

Step-by-step explanation:

54437475+6375322464366475456

Answers

Answer:

6.37532246E18

Step-by-step explanation:

what is the variables on both sides equations? 3x - 6 = 7x + 1​

Answers

Answer:

3x-6=7x+1

=> 3x-7x = 6+1

=> (-4)x=7

=>x = 7/4 = 1.75

Need help.
Find the value of each variable.

Answers

It’s an isosceles triangle, so x would also equal 13, and now we just do the Pythagorean thrm

a^2+b^2=c^2

a=13 b=13

13^2+13^2= c^2

169+169= c^2

338= c^2 *square root both sides*

c= 18.38=y

Mariela recolecto 625 mililitros de agua que gotea de su caño en 10 minutos, ella desea saber ¿cuanta agua gastara en una semana ?

Answers

Answer:

En una semana gastará 705,6 litros.

Step-by-step explanation:

Con la información proporcionada, puedes calcular cuánta agua gastará por día usando una regla de tres teniendo en cuenta que un día tiene 24 horas y estas equivalen a 1440 minutos. Además, puedes convertir los 700 ml a litros, considerando que 1 litro son 1000 mL, lo que significa que los 700 mL equivalen a 700/1000=0,7 Litros.

 10 min    →  0,7 L

1440 min →       x

x=(1440*0,7)/10

x=100,8 L

Ahora que conoces la cantidad de agua que gastará por día, puedes multiplicar esta cantidad por 7 que es el número de días en una semana:

100,8*7=705,6 L

De acuerdo a esto, la respuesta es que en una semana gastará 705,6 litros.

Please help asap!!

Kianna and Jos houses are reflections of each other across both axes. What are the coordinates of Jo's house?

Answers

Answer:

(-4,-2)

Step-by-step explanation:

(4,-2) because it’s a reflection which means the x stays the same but the y variable changes to a negative

Can someone please help me with math

Answers

Answer:

the answer is D

Step-by-step explanation:

the graph has a negative correlation

Which of the following points lies on the circle whose center is at the origin and whose radius is 10?

Answers

Answer:

Step-by-step explanation:

[tex]y^2=10-x^2\\ \\ 0=10-\sqrt{10}^2\\ \\ 0=10-10\\ \\ 0=0\\ \\ (\sqrt{10},\ 0)[/tex]

hiii please help i’ll give brainliest thanks

Answers

Answer:

The answer is 0

Hope this helps!

Answer:

0

Step-by-step explanation:

please brainliest

72/9 - 1 x 2^3

8 - 8

= 0

< Exit
Topic 8 Test
Due 03/26/21
Fencing How much fencing is required to enclose a circular garden whose radius is 14 m? Use
22
for at
7.
About m of fencing is required to enclose the circular garden.
(Type an integer, proper fraction, or mixed number.)
Enter your answer in the answer box.

Answers

Answer:

88m of fencing

Step-by-step explanation:

the cicumference of the garden is what we are looking out for,

and with the raduis .ie.14m

C=2πr

C=2•22/7•14

C=88m

Find X pls help me :3

Answers

Answer:

Highlight the question, Do Ctrl+Shift+I, it will show this page with a bunch of codes and stuff and you can find the answer in there

Step-by-step explanation:

a factory makes car batteries. The probability that a battery is defective is 1/13. If 200 batteries are tested about how many are expected t be defective.
A. 20
B. 15
C. 187
D. 13

Answers

Answer:

defective battery=200×1/13=15.3=15 is your answer

Number of expected defective batteries are option(B) 15

What is Probability?

Probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur, or how likely it is that a proposition is true.

Given,

Probability that a battery is defective = [tex]\frac{1}{13}[/tex]

Total number of batteries = 200 batteries

Number of expected defective batteries = [tex]200(\frac{1}{13})[/tex] ≅15 batteries

Hence, the number of expected defective batteries are option (B) 15 batteries

Learn more about Probability here

https://brainly.com/question/11234923

#SPJ2

Jerry needs 8 pieces of rope to help
tie down his tent. If each piece of rope
needs to be 4 feet each, what is the
total amount of rope needed?

Answers

32 Feet
Eight times four equals thirty-two

i need help! please
domain range and end behavior of f(x)=1-x^2

Answers

Answer:

Here's a screenshot. Hope this helps

Answer:

i think

]-infinte,1[u]1,+infinte[

2
3
4
5
Simplify.
(-v2+3v – 7) + (402+5v+6)

Answers

Answer: -v^2 + 8v + 401

Step-by-step explanation:

The distance between 2 cities on a map is 4.125 inches. Find the actual distance i’d the scale on the map is 2 inches = 40 miles. GIVING BRAINLY !!!

Answers

Answer: 165 miles

Step-by-step explanation:

PLS PLS HELP WITH THIS

Answers

Answer:

the answeris i don't know bye

Step-by-step explanation:

bye

:))))))))))))))))))))​

Answers

Answer:

20/5

Step-by-step explanation:

hello I'm confused so yea

Solving the equation -5x = 4y + 8 for y gives

Answers

Answer:

y= -2-5/4x

x= -4/5y-8/5

Step-by-step explanation:

i hope this helps :)

What is the speed of a boat trip that lasted 4.5 hours with a constant speed and is able to travel a distance of 60.75 kilometers?

Answers

the answer is 13.5 kilometers per hour

can somebody help me with this

Answers

C is a right angle which means it measures 90 degree and total sum of angles of any triangle is equal to 180 so that we found the value of X and substituted it in angle A and angle B is already equal to X

Russel randomly surveys seventh graders in his school and finds that 6 of 30 attend summer camp. if there are 200 seventh graders in his school, about how many are expected to attend summer camp.

Answers

40 seventh-graders are expected to attend summer camp.

Because

6/30=x/200

6/30= 6 divided by 30= 0.2

0.2x200=40

Manny is reading a book. The book has 180 pages. On Sunday he read
1/3 of it. On Monday, he read 44 pages. How many pages does he have left to read?

Answers

Answer:

He has 76 pages left

Find four solutions of each equation. Write the solutions as ordered pairs.
3. y = 3x
4. y = -2x + 11

Answers

y = 3x

x y

-2 -6

-1 -3

0 0

1 3

y = -2x +11

x. y

-1. 13

0 11

1. 9

2. 7

This one is really hard for me can someone please help!

Answers

Answer:

Triangle=94

Rectangle=864

Step-by-step explanation:

Triangle:

4*3=12, *2=24

6*5=30

6*3=16

4*6=24

24+24=48, +30=78, +16=94

Rectangle:

30*7=210, +210=420

30*6=180, +180=360

7*6=42, +42=84

420+360=780, +84=864

Solve for x. What does x =

Answers

Answer:

x = 1

Step-by-step explanation:

it's because it is an isosceles triangle

Answer:

x = 1

Step-by-step explanation:

8x + 5 = 2x + 11      (since ∠D = ∠E, triangle is isosceles)

combine like terms:

6x = 6

x = 1

1. Solve for x
(5x - 10)

Answers

Solveeeeeeeeee for x 5(x-2).

Answer:

5 (x - 2)

Step-by-step explanation:

1. Factor by grouping

5 (x - 2)

This is the answer.

I hope this helps      :)

PLEASE HELP FAST !!
3/2+19/3

Answers

Answer:

28/6 yeah thats right wasp

Answer:

Step-by-step explanation:

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