Mathematics High School

What would you multipy and to which equation to start solving by using the elimination method? Then would you add or subtract them?
7x + 4y = -4
5x + 8y = 28

Answers

Answer 1

Answer:

multiply the first equation by -2, then add them

Step-by-step explanation:

7x+4y=-4         *-2 7x+4y=-4 *-2 = -14x-8y=8

5x+8y=28

-14x-8y=8                       x=-4, y=6

-9x=36

x=-4

7(-4)+4y=-4

-28+4y=-4

4y=24

y=6

Related Questions

What do I do I don’t know the answer

Answers

Answer:

B) 114.511m^3

Step-by-step explanation:

Formula of a cylinder is πr^2 x h

r = radius (half of diameter)

h = height

Since it is 3/4 full you only do 3/4 of the height so- 0.75 x 9.60 which equals 7.2

Half of the diameter is 2.25. 2.25^2 = 5.0625.

The volume of the cylinder = 5.0625π x 7.2

By solving this, you will get approximately 114.511 m^3 as your answer.


Suppose you have 30 CDs. You know that you have 11 more CDs that your friend. Write an equation to find the number of CDs your friend has.

Answers

Answer:

30-11=19

so your friend has 19 becuase you have 11 more which is 30 and when you minus it you get the answer

HELP SOMEONE ANWSER PLEASE

Answers

Answer:

A = 40 cm²

Step-by-step explanation:

The area (A) of a trapezium is calculated as

A = [tex]\frac{1}{2}[/tex] h (b₁ + b₂)

where h is the perpendicular height and b₁, b₂ the parallel bases

Here h = 5, b₁ = 10 and b₂ = 6 , then

A = [tex]\frac{1}{2}[/tex] × 5 × (10 + 6) = 0.5 × 5 × 16 = 40 cm²

Find the area of the circle. Round your answer to the nearest tenth. Use 3.14. The radius is 9

Answers

Answer:

28.26

Step-by-step explanation:

i wasnt sure what it was the the nearest tenth im really really sorry but i hope that helps

A worker has to drive her car as part of her job. She receives money from her company to pay for the gas she uses. The table shows a proportional relationship between y, the amount of money that the worker receives, and x, the number of work-related miles driven.

Write the equation that can be used for this situation.​

Answers

Answer:

0

Step-by-step explanation:

Show work pls for brainly

Answers

what grade are u in that's easy lolll

Step-by-step explanation:

Convert the angle 0=17pie/18 radians to degrees.
Express your answer exactly.

Answers

170° is the answer I got hope it helps
The answer is 170 hope this helps

what is -8g=240 using one step equation

Answers

To isolate g, divide both sides with -8.

240/-8= -30
g=-30

Answer:

30

Step-by-step explanation:

If 5 cans of soup cost $4.49, what apuro be the cost for 20 more?

Answers

Answer:

$17.96

Step-by-step explanation:

4.49 for 5

5 times 4 = 20

4.49 times 4 = 17.96

PLEASE HELP THIS IS A MONTH LATE


Solve each equation for y. Use the given values for x to find the values for y. Write answers as ordered pairs.

Answers

Answer:

1. x =-4 (-4,27)

x =0 (0,3)

x = 2 (2 , -9)

2. x = -1 (-1 , 3)

x = -2 (-2 , 2)

x = -3 ( -3, 1)

3. x = -3 (-3 , 13)

x = 1 (1 , 1)

x = -2 ( -2, 10)

4. x =2  (2 , 24)

x = 3 (3 , 30)

x = -2 (-2 , 0)

5.x = -3 (-3 , -2)

x = 2 (2 ,-12 )

x =4  (4 , -16)

6. x = -1 (-1 , -2)

x = 0 (0 , 2)

x = 2 (2 , 10)

7. x = -2 (-2 , -10)

x = 0 (0 , -14)

x = 3 (3 , -20)

(pls mark brainliest <3 ty)

Step-by-step explanation:

1) Nishi has a total of 18 coins that are nickels and
pennies. The value of the coins is $0.78. How
many nickels and pennies are there?

Answers

I believe it’s 3 pennies and 15 nickels yea it is because
3*0.01=0.03, and
15*0.05=0.75 and
0.75+0.03=0.78 and
3+15=18.

Did I confuse you or no? Sorry if I did.

El costo total en pesos para producir calcomanías,es el monto del alquiler del local más 1.5 veces el número de calcomanías producidas por día

Answers

Answer:

.......................................................

is the graph increasing or decreasing​

Answers

Answer:

Depends on how the X and Y values are oriented but if the X value is on the bottom and the Y is on the top, then the graph is decreasing

Step-by-step explanation:

Have a great day!

Answer:

decreasing

Step-by-step explanation:

Tim played 20 games of draughts.
He won 16 of these games.
a) What fraction of the games did he win?
Give your answer in its simplest form.​

Answers

Answer:

4/5

Step-by-step explanation:

Played 20 games. Won 16. Both numbers have a 4 in common. divide 16 by 4.. which is 4. Divide 20 by 4... which is 5. That means Tim won 4/5 of the games played.

Answer :4/5

Step-by-step explanation:

Because we write  16/20 and simplify it by 4 and thats the simplest form

please help i’ve done a (5x) but i need b) and c)

Answers

Answer:

b would be 6xy

c would be 6xy as well

Step-by-step explanation:

Not really sure how to explain it, I just know it

Answer:

b) 6xy

c) 6xy

Step-by-step explanation:

b) 6 × x × y

Since there are no like terms, just straight away remove the multiplication signs. So the answer is:

= 6xy  

c) 2 × x × 3 × y

2 and 3 are like terms since they are both natural numbers (positive integers), you can multiply 2 with 3. The answer will be:

= 6xy

SOMEONE HELP ME PLEASEE! who is correct?

Answers

Answer:

neither

Step-by-step explanation:

Enter the Sum: 8/6 - 6/12 =

Answers

Answer:

8/6−6/12=56

Step-by-step explanation:

(86×22)−(612×11)=?

16/12−6/12=?

16−6/12=10/12

10÷2/12÷2=56

8/6−6/12=56

Guided Practice


Find the slope and y-intercept of the equation.y=[tex]\frac{2}{3}[/tex]x+1


A.
1 ; [tex]\frac{2}{3}[/tex]


B.
23; 1


C.
23; −1

Answers

Answer:  B. 2/3; 1

Use the slope-intercept form  y  =  m  x  +  b  to find the slope  m  and y-intercept  b .

Slope:  

(2) /(3)

y-intercept:  

( 0 ,  1 )

Step-by-step explanation:

Find the slope and y-intercept of the equation. y = (2)/(3)x + 1

Find the Slope and y-intercept

Caitlin drew a circle and labeled the circle S. The diameter of Caitlin’s circle is 12 m. Which of the following best represents the area of Caitlin’s circle?

A. 452 m^2
B. 38 m^2
C. 113 m^2
D. 75 m^2

Answers

Answer:

C

Step-by-step explanation:

Radius: 12 / 2 = 6 m

Area: 6^2 x pi = 113 m^2

Answer:

c

Step-by-step explanation:

area = π · r²

to change the diameter to radius you just divide by 2

12/2=6 so the radius is 6

then we just plug 6 into r for the circle are formula

6²=36

36x3.14=113.04 so her best answer choice is c

What is the slope of the line that passes through the points(2,−3) and(2,13)?

Answers

Answer: undefined

Step-by-step explanation: slope is the difference in y values over difference in x values any number over 0 is undefined

Please help and give explanation

Answers

Answer:

100 mins

Step-by-step explanation:

total no of gallons pool can hold=4500

gallons pool already holds=1500

rate of adding water= 30 gallons per min

time he can continue filing= 4500-1500/30

=3000/30

=100 minutes (m value)

correct me if I'm wrong appreciate me if I'm good

You only have to get this second answer right (30 points)

Answers

Answer:

6 nights with 4 logs left over

Answer:

6 with 4 leftover

Step-by-step explanation:

Just some division

In ΔQRS, the measure of ∠S=90°, QR = 82 feet, and RS = 60 feet. Find the measure of ∠R to the nearest tenth of a degree.

Answers

Answer:

43.0°

Step-by-step explanation:

cos∅=adj/hyp

cos∅=60/82

∅=cos-1 60/82

∅=cos-1  0.731707317073

∅=42.97028393174°

Round: 43.0°

Answer:

R=42.9703≈43  

Step-by-step explanation:

Deltamath

How many nights must be booked so that the cost is the same?

Answers

Answer:

5

Step-by-step explanation:

its where the line matches up.

Answer:

5

Step-by-step explanation:

????????????????????

Due Today!!!!

Suppose takes a student's grade and gives a student's name as the output.

True or False, is an example of a function.

Answers

this would be true.

the word output automatically assumes that it’s a fraction or an equation to a fraction.

Answer:

its function

Step-by-step explanation:

because the person intended to do it

Does anyone know how to do 7? it’s due tonight and ive been stuck for a while. thanks.

Answers

Answer:

Like −135

Step-by-step explanation:

If you were to plug it all into a calculator that's the answer do with that what you well

how can I solve -7(-8+10-5) please explain​

Answers

Answer:

so is actually bidmas of bodmas however you want to call it but what's in the brackets you always have to do first so what you would do is because as for subtraction comes last you 1st to -8+10 which is to then you do 2-5 which is -3 so then you do -7 times -3 which because if two minuses or times or multiplied like everyone say it would be a positive so that

It's the answer is 21

Step-by-step explanation:

Answer:

21

Step-by-step explanation:

need help with my hw

Answers

Answer: B

Step-by-step explanation:

ok, plz help me, nobody has helped me for the last 4 questions!

Answers

gooooooooooooooooooo

Answer:

1. 2/6=1/3   0.333  33%

2. 4/6=2/3  0.666 66%

3. 3/6=1/2  0.50  50%

Step-by-step explanation:

Find the value of x.

A) 4 square root 2 / 2
B) 4
C) 4 square root 2
D) 4 square root 3

Answers

Answer:

[tex]B) \: \boxed{4}[/tex]

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