I need help with these problems and if possible to do them both I would really appreciate it

Answers

Answer 1

#1. Because we know y is equal to 7x - 5, you can substitute 7x - 5 for y in the second equation. Then you can solve for x.

2x + y = 13
2x + (7x - 5) = 13
9x - 5 = 13
9x = 18
x = 2

Now that you know x = 2, you can solve for y.
y = 7x - 5
y = 7(2) - 5
y = 14 - 5
y = 9

To double check this, plug in 2 for x and 9 for y in the second equation.

2x + y = 13
2(2) + (9) = 13
4 + 9 = 13
13=13

Both sides equal each other so (2,9) is a solution to the system of equations.

#2. Because x = -5y - 4, you can substitute -5y - 4 for x in the second equation and solve for y.

x - 4y = 23
-5y - 4 - 4y = 23
-9y - 4 = 23
-9y = 27
y = -3

Now, plug y = -3 into y in the first equation.

x = -5(-3) - 4
x = 15 - 4
x = 11

To double check, plug in -3 for y and 11 for x in the second equation.

x - 4y = 23
11 - 4(-3) = 23
11 + 12 = 23
23 = 23

Both sides equal each other, so (11, -3) is the right solution.

Related Questions

The area of the rectangular garden shown is 19.5 square meters. How many meters of fencing are needed to go around the garden? Explain.

Answers

Answer:

17.66m

Step-by-step explanation:

Let the area of the rectangular garden be L²

A = L²

19.5 = L²

L = √19.5

L = 4.416

Perimeter = 4L

Perimeter = 4(4.416)

Perimeter of the garden =17.66m

Hence the number of meters of fencing that are needed to go around the garden is 17.66m

Help me pleaseeeee!!!!

Answers

Answer:

I would say 3 is a Equiangular Triangle, And both 4 and 5 are Acute Triangles.

Step-by-step explanation:

Sorry if I'm wrong:/

Jen bowls every Saturday. She pays $6 per hour to bowl and an additional $3 to rent bowling shoes.

Answers

Answer:

6x + 3

x = hours she bowls

Find the distance between two lakes as shown on map if the scale on the map is 1 cm : 8 km, and the actual distance between the lakes is 296 km.

Answers

Answer:

Step-by-step explanation:

Find the scale 296/8=37

The do 37 x 1=37

Help please , will mark brainliest

Answers

Answer:

200 in^2

Step-by-step explanation:

First step- the first square shows the lenght and the bottom shows the width and 10 times 10 is 100

step 2- so the first is 100 double it and 100 times 2 is 200

Step 3- so 200 inches^2 is your anwser.

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No questions here ????

3(×+2)=24 can you help me

Answers

Answer:

x = 6 if that's what your asking

Step-by-step explanation:

please give brainliest

Answer:

3x or 7.333333

Step-by-step explanation:

3(x+2)=24

-2 -2

____________

3x=22

Hayden rides his bicycle to and from school every day. in 5 days, he wrote a total distance of 9 kilometers. at this rate how many kilometers will he ride in 60 days
A. 108 km B. 105 km C. 45 km D. 33 km

Answers

Answer:

A. 108

Step-by-step explanation:

60 x 9 = 540

540 divided by 5 = 108

Answer:

Step-by-step explanation:

5 days he rode 9 kilometers

60 divided 5=12

12x9=108

question on picture urgent

Answers

Answer:

Step-by-step explanation:

dang i dont know

An arts academy requires there to be 3 teachers for every 63 students and 5 tutors for every 60 students . How many students does the academy have per teacher? Per tutor? How many tutors does the academy need if it has 120 students?

Answers

Answer:

6 teachers and 10 tutors.

Step-by-step explanation:

if there are 120 student and they need 3 teachers per 63 students then there would be 6 teachers because 63x2=126 subtract the six and you get the number of students. 120 so 6 teachers and if they need 5 tutors per 60 student then double the students to get 120 and double the tutors to get 10.

Plzzzzzzzzzzzzz help me i begggg u just find the number for the boxes

Answers

Answer:8.124. 9.42 10. TW=4.015 equation sin(35)=4.015/7. 11.WS=10.459 equation: Tan(69)=10.459/4.015

Step-by-step explanation:

use sine rule and tan rule like upwards and hope you get it right mate

Find the value of f(9).

Answers

Answer:

-2

Step-by-step explanation:

It tells us to find the value of f(9) at the given graph. This means that it wants us to find the y value when x=9. Looking at the graph, when x=9, y=-2.

Write each sum or difference as a product with positive arguments -4(sin4x - sin2x) A) 8cos 3xsin x B) 8sin xsin 3x C) -8cos 3xsin x D) 8cos 3xcos x

Answers

Answer:

C) -8cos 3xsin x

Step-by-step explanation:

To express -4(sin4x - sin2x) as a product, we use the formula sinA - sinB = 2cos[(A + B)/2]sin[(A - B)/2.

Comparing sin4x - sin2x with sinA - sinB, A = 4x and B = 2x.

Substituting these into the equation, we have

sin4x - sin2x = 2cos[(4x + 2x)/2]sin[(4x - 2x)/2

sin4x - sin2 x = 2cos[6x/2]sin[2x/2]

sin4x - sin2x = 2cos3xsinx

So, -4(sin4x - sin2x) = -4(2cos3xsinx) = -8cos3xsinx

So, -4(sin4x - sin2x) = -8cos3xsinx

Thus, the answer is C

The volume of a cylinder is 289 pie in. and the height of the cylinder is 1 in. What is the radius of the cylinder?

Answers

Answer:

[tex]radius = 17 \: inches[/tex]

Step-by-step explanation:

[tex]volume \: of \: a \: cylinder = \pi \times {r}^{2} \times h \\ \\ r = radius \\ h = height =1 \: inch \\ \\ volume \: of \: cylinder = 289\pi {in}^{3} \\ 289\pi = \pi \times {r}^{2} \times 1 \\ 289 = {r}^{2} \\ r = \sqrt{289} \\ r = 17 \: inches[/tex]

Help please thanks!!!

Answers

Answer:

The 4th choice which is y+1=2(x-3)

Organizers are launching fireworks over the top of the Washington
Monument in Washington, DC. Due to costs, they would like to find the
smallest shell possible that will reach the correct height. The monument
is 555 feet tall. The initial velocities of each size shell are given below.

size (in.) 2 3 4 5 6 8 10 12
initial velocity (ft/s) 117.5 144 166 186 203.5 235 263 287.5

The height of the firework t seconds after it is launched is given by
h = -16t^2 +vt where v is the initial velocity. Use the discriminant to determine
the smallest size shell that will reach over 555 feet. Explain. PLEASE HELP I WILL MARK BRAINLIEST!!!

Answers

sorry I don't know

HELP ONLY WITH PART A I ALREADY DID PART B INSTRUCTIONS ARE IN PICTURE

Answers

Answer:

They could take a survey of people who would and who would not take the fitness class

Write an expression for the perimeter of this shape.

Answers

Answer:

y+2x+5

Step-by-step explanation:

to find a find perimeter of a quadrilateral you just need to add all the length of the lines it have.

1/2=0.5

0.5y+0.5y+x+x+5

y+2x+5(answer)

What is the value of 56 - (3 to the power of 3 + 13)

Answers

Answer:

Step-by-step explanation:

3^3=27 then you have 27+13=40 now you have 56-40=16

Question 14 pls for my math class

Answers

the answer is c but i might be wrong

(9+5)(3+2)⁰
Evaluate

A:0
B:1
C:14
D:15

Answers

Answer:

C:14

Step-by-step explanation:

(9+5)(3+2)°= (9+5)(1)=14

a musician charges a $75 travel fee and a performance fee of $150 per hour. The musician made $675 after a show. Write an equation you can use to find out how long the show was.

Answers

Answer:

(75 * F) + (150 * T) = 675

Step-by-step explanation:

Answer:

y=150x +75

The value of x when y=675 is 4.

Step-by-step explanation:

x represents the number of hours long the show was.

y represents the amount of money the musician made.

find the circumference of each circle. round to the nearest tenth. use 3.14 for Pi.

7.9 inches
15.7 inches
6.3 inches

Answers

Answer:

its is 15.7

Step-by-step explanation:

Gran makes 18 pints of jam in 3 days.How pints can she make in 7 days at this rate?

Answers

Answer:

gran can make 42 pints of jam in 7 days

Step-by-step explanation:

first divide 18 by 3 and you'll get 6 pints in 1 day then multiply 6 and 7 and you get 42

Matt manages a company that monitors the wastes from a company that produces radioactive byproducts. Matt is most likely a(n)

Answers

Answer:

Nuclear scientist

Step-by-step explanation:

A nuclear scientist does quite a range of activities in the fields of physics and chemistry. Some of these includes applied research to basic research in physics and also in health physics.

Most of their work involves radioactivity. And they make use of sophisticated equipments.

For Matt to manage a company that monitors radioactive byproducts he must be a nuclear scientist.

Gabrielle uses 7.6 pints of blue paint and white paint to paint her bedroom walls. 1 4 of this amount is blue paint, and the rest is white paint. How many pints of white paint did she use to paint her bedroom walls

Answers

Answer:

1.9

Step-by-step explanation:

Gabrielle uses 7.6 pints of blue and white paint to paint her bedroom

1/4 of the paint is blue paint

Therefore the amount of white paint she used to paint her bedroom can he calculated as follows

= 1/4

= 0.25×100

= 25%

25/100×7.6

= 2.5 × 7.6

= 1.9

Hence 1.9 pints of white paint was used to paint the room

HELP ASAP 10 POINTSSS

Answers

Answer:

the scale factor is 1.25

Step-by-step explanation:

Hope this helps

Plssssssss help answer all 3 plssssss I will give the thingy

Answers

I’m not exactly sure but for all questions it should be the answer 6

what is -11n=77
answer fast!

Answers

Answer:

-7 bro

Step-by-step explanation:

An instructor at an army base wants to know if a new program that teaches gun safety is effective. Which procedure would be the best method of evaluation?

Answers

Answer:

An instructor at an army base wants to know if a new program that teaches gun safety is effective is described below in brief details.

Step-by-step explanation:

Although of your shooting practice, the handgun safety program illustrates the center fundamentals of handgun protection so that you can tour the range with courage and with safety in the brain. Study how to accurately control, transport, and deposit your handgun, as well as how to keep children secure around handguns.

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