Mathematics College

-7x + y = -19

-2x + 3y = -19

solve for x and y using elimination

Answers

Answer 1

Answer:

x = 2, y = -5

Step-by-step explanation:

[tex]-7x + y = - 19 --> -21x + 3y = -57[/tex]

[tex]\left \{ {{-21x+3y=-57} \atop {-2x+3y=-19}} \right.[/tex]

subtract

[tex]-19x = -38\\x= 2[/tex]

substitute

[tex]-2*2 + 3y = -19\\-4 + 3y = -19\\3y = -15\\y = -5[/tex]

Related Questions

Pleaseeee helppp due in 8 minutesss please!!

Answers

Answer:

B 5x=34.5

it's too easy in which class you studies

Answer: It would be b and c

Step-by-step explanation: I could be wrong and Im sorry if I am. Your trying to figure out how long each pencil is.

HELP ASAP!! WILL gIVE BRAINLIEST Which statement best explains the effectiveness of the conclusion paragraph?

Answers

I think the answer is D not sure tho

Let me know if it’s wrong

Answer:

I believe the answer is D

Step-by-step explanation:

I believe it is D because the author does restate the thesis and has powerful reasoning

Write four hundred eighty-five thousandths as a decimal number.

Answers

Answer:

0.485

Step-by-step explanation:

Find the area of a circle with a diameter of 6 cm.
User = 3.14
A 9.42 cm
18,84 cm
© 28.26 cm
0 113.01 cm

Answers

I really need points

write 1/6 as a percent

Answers

Answer:

16.6%

Step-by-step explanation:

hope this helps

have a great day

___% 25 miles is 16 miles

Answers

Answer:

64%

Step-by-step explanation:

Answer:

64%

Step-by-step explanation:

d. 2/5 (j + 40) = -4

Answers

Answer:

-50

i have made it in the above picture

hope it helps

Step-by-step explanation:

2/5 (j + 40) = -4

(j + 40) =-10

j=-50

Hope it helps

Kim bought a hat for $21.80 and received a discount of 25%. What is the sales price?

Answers

Answer:

16.35

Step-by-step explanation:

21.8 / 4= 25%

= 5.45

21.8-5.45= 16.35

Which graph represents the solution to the system of equations below?


A.
B.
C.
D.

Answers

C. -4,-5 hope this helps :)

Answer:

B (-3,-4)

Step-by-step explanation:

2/5 is a positive trend starting at -2.

y=-4 starts on the y-axis and goes horizontal.

PLEASE HELP ASAP I NEED HELP PLEASE????):

Answers

axis of symmetry is the dashed red lines of the equation/parabola. The symmetry is basically like the mirror of both sides of a parabola.

ANSWER: x = 2

write a general formula to describe the variation: S varies jointly with the inverse of the square of P and the inverse of the cube of L; S=4 when P=2 and L=5

Answers

Answer:

S=2000/P^2L^3

Step-by-step explanation:Step 1:Write the correct equation. Combined variation problems are solved using a combination of direct variation (y = kx), inverse variation , and joint variation (y = kxz) equations. When dealing with word problems, you should consider using variables other than x, y, and z, you should use variables that are relevant to the problem being solved. Also read the problem carefully to determine if there are any other changes in the combined variation equation, such as squares, cubes, or square roots.Step 2:Use the information given in the problem to find the value of k, called the constant of variation or the constant of proportionality.Step 3:Rewrite the equation from step 1 substituting in the value of k found in step 2.Step 4:Use the equation found in step 3 and the remaining information given in the problem to answer the question asked. When solving word problems, remember to include units in your final answer.

PLEASE HELP ME PLEASE

Answers

Answer:

3. 9 3/5

6. 4 3/5

Step-by-step explanation:

Which linear function represents the line given by the point-slope equation y + 1 = –3(x – 5)?

f(x) = –3x – 6
f(x) = –3x – 4
f(x) = –3x + 16
f(x) = –3x + 14

Answers

Answer:

f(x) = -3x + 14

Step-by-step explanation:

y + 1 = -3(x - 5)

solving,

y + 1 = -3x + 15

y = - 3x + 14

we know that f(x) = y so,

f(x) = -3x + 14

WILL GIVE BRAINLST

hAVE AN AMAZING DAY

Answers

Answer:

1 A= 3 cm

2 C= 37/99

Step-by-step explanation:

Volume is l * w * h

or s³ for cubes

∛27= 3

3/7= 0.43

3/70= 0.04

37/99= 0.3737373737 etc.

37/100= 0.37

A gorilla needs to eat at least 40 pounds of food each day. The zoo feeds the gorilla using canisters that contain 4 pounds of food. The gorilla
has already consumed 28 pounds of food. How many more canisters z of food does the gorilla need to ear? Write your answer as an inequality.

Answers

4z+ 28 ≥ 40

At least would be present as using ≥ or greater than or equal to symbol.

So far the gorilla has consumed 28 pounds of food and each can contains 4 pounds of food.

So: 28 pounds of food/ 4 pounds of food per can= 7 cans consumed

40 pounds needed - 28 pounds consumed= 12 pounds left

12 lbs/ 4 lbs per can= 3 cans left for the gorilla to exceed its goal

Hopefully this helps! :)

Please please help please

Answers

Should be increasing because the line is going up slanted upwards :)
I believe it’s constant

How many 13s are in 223?

Answers

Answer: There are 17 times 13 in 223. The answer you divide 223 by 13 which would get you 17.153846153846.

Step-by-step explanation:

THANKS SO MUCH HELP FAST

Answers

Answer:

381

Step-by-step explanation:

4x4x4x4 (4 to the fourth power) plus 125

Answer:

381

Step-by-step explanation:

HOPE THIS HELPS YOU OUT! BE THE FIRST TO COMMENT /FREE ON THESE COMMENTS TO GET A FREE BRAINLIY AWARD! PLZ ALSO CONDISER MARKING ME BRAINLIEST AND THANKS! MY JOURNEY HAS JUST BEGAN ON BRAINLY SO ASK ME IF U HAVE ANY QUESTIONS! -BEACHVIBES23

An envelope is 7 inches long and 3 inches wide.What is the area of the envelope surface?​

Answers

Answer:

21 in^2

Step-by-step explanation:

Area = Width * Length

Area = 3 * 7

Area = 21

Answer:

11. 2/3 inches squared.

Step-by-step explanation:

(3.1/3 * 3.1/2 = 10/3 * 7/2 = 70/6 = 11. 2/3)

A quiz consists of 770 true or false questions. If the student guesses on each question, what is the mean number of correct answers?​

Answers

385 or 1/2 i suppose

The mean number of correct answers will be equal to 385.

What is mean?

The mean is defined as the ratio of the sum of the all the numbers given by the total count of the numbers.

The total questions are 770 and consist of the true and false.

The mean of the numbers will be given as:-

Mean   =   770  /   2  =   385

Therefore mean the number of correct answers will be equal to 385.

To know more about mean follow

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PLEASE ANSWER ASAP WITH WORK FOR BRAINLEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answers

Answer:

.5

Step-by-step explanation:

(.25)(1)(2)=.5 or just 1/2

A pyramid has square base with side s. The height of the pyramid is 2/3
that of lts side. What Is the expression for the volume of the pyramid?
A. V=2s^2
B. V=2s^3
C. V=2/3s^2
D. V=2/9s^3
E. V=1/3s^3

Answers

Answer:

D. V=2/9s^3

Step-by-step explanation:

D.

5x-8(3y+13)-1 what's the expression

Answers

Did u try looking it up?

which ideas about functions are the most helpful​

Answers

Answer:
It helps in calculating the price of groceries such as fruits.
Step-by-step explanation:
Remember, functions are mathematical expressions that represent or shows the relationship between one or more variables.
For example, let's say a young girl wants to shop for 20 oranges in a mall. If we express the price using the function where;
y represents the total cost of the oranges,
20 represents the number of oranges,
x represents the cost per orange (assumed to $0.99)
Then, by means of the knowledge of function, the girl determines the total cost she to be $19.8 (20*0.99).

Which list accurately sorts the sequence of events that preceded the United States' entry into World War II?

The Germans invaded Poland; the Germans conquered Britain; Japan attacked Pearl Harbor, the United States declared war on Germany and Italy.


The Germans conquered France; the Germans invaded the Soviet Union; Japan attacked Pearl Harbor; the United States declared war on Japan.


The Germans invaded the Soviet Union; the Italians joined the Axis powers, the United States sent military assistance to Britain; the Germans and Italians declared war on the United States.


The Germans conquered France; Japan attacked Pearl Harbor; the Germans invaded the Soviet Union; the United States declared war on Japan and Germany​

Answers

♡ The Question ♡

-Which list accurately sorts the sequence of events that preceded the United States' entry into World War II?

* ୨୧ ┈┈┈┈┈┈┈┈┈┈┈┈ ୨୧

* ♡ The Answer ♡

-The Germans conquered France; the Germans invaded the Soviet Union; Japan attacked Pearl Harbor; the United States declared war on Japan.

*୨୧ ┈┈┈┈┈┈┈┈┈┈┈┈ ୨୧*

♡ The Explanation/Step-By-Step ♡

-The Germans conquered France and invaded the Soviet Union before the Japanese attacked Pearl Harbor and the United States entered World War II.

*୨୧ ┈┈┈┈┈┈┈┈┈┈┈┈ ୨୧

*♡ Tips ♡

-No tips provided!

The Germans conquered France; Japan attacked Pearl Harbor; the Germans invaded the Soviet Union; the United States declared war on Japan and Germany​ is correct list.

What is World war?

A world war is an international conflict which involves all or most of the world's major powers.

The correct sequence of events that preceded the United States' entry into World War II is:

The Germans conquered France; Japan attacked Pearl Harbor; the Germans invaded the Soviet Union; the United States declared war on Japan and Germany.

Therefore, the correct list that accurately sorts the sequence of events is:

The Germans conquered France

Japan attacked Pearl Harbor

The Germans invaded the Soviet Union

The United States declared war on Japan and Germany.

Hence, the Germans conquered France; Japan attacked Pearl Harbor; the Germans invaded the Soviet Union; the United States declared war on Japan and Germany​ is correct list.

To learn more on World war click:

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Two cars leave town at the same time going in the same direction. One travels 55 miles per hour and the other travels 48 miles per hour. And how many hours will they be 49 miles apart? ​

Answers

Answer:

Question 160644: Two cars leave town at the same time going in opposite directions. One travels 55 mph and the other travels 48 mph. In how many hours will they be 206 miles apart? T=2 HOURS THEY WILL BE 206 MILES APART

Ok thank you

Answer:

its 7hrs

Step-by-step explanation:

Another way to think about it

Every hour, they get 7 miles apart from each other

Since one is 7 miles per hour faster than the other

7*h is their separation for h hours.

Solving 7*h = 49 gets you the hours for which the separation is 49 miles

3/8 divided by 5/6 in simplest form

Answers

Answer:

9/20

Step-by-step explanation:

Make 5/6 a reciprocal then turn the division sign into a multiplication sign 5/6 will become 6/5 then multiply across by 3/8, 3/8 x 6/5 = 18/40 = 9/20

A rectangular box has 6 flat faces and ? straight edges.
B. 6
c
8
OO
D.
10
E.
12

Answers

Answer:

B

Step-by-step explanation:

48382292292929983393929292

PLEASE I NEED HELP !!!!!!!!!!!!!

Answers

20 is the answer for that question not 100% sure but I want the 5 points

please help me answer this question

Answers

1) 47°
2) 9cm

explanation

Answer:

a) 47  b) 9 cm

Step-by-step explanation:

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