Mathematics High School

solve: 2x + 5y = -1
3x + 2y = 4

Answers

Answer 1

Answer:

x = 2, y = -1

(x,y) = > (2,-1)

Step-by-step explanation:

2x + 5y = -1

3x + 2y = 4

-3(2x + 5y = -1) = > -6x - 15y = 3

2(3x + 2y = 4) = > 6x + 4y = 8

-6x - 15y = 3

6x + 4y = 8

-11y = 11

/-11  /-11

y = -1

2x + 5y = -1

2x + 5(-1) = -1

2x -5 = -1

   +5   +5

2x = 4

/2   /2

x = 2

(x,y) = > (2,-1)

Hope this helps!

Related Questions

PLEASE PLEASE help me out!!!
Trying to get my grade up

Answers

(4, 1) the process is shown in the following picture

Answer: x=4 and y=1

Step-by-step explanation:

From the first equation, we get y = 9 - 2x. Substitute this into the second equation we get

3x - 4(9 - 2x) = 8

3x - 36 + 8x = 8

11x = 44

x = 4

y = 9 - 2(4)

y = 1

Hope this helps

Help me with geometry please

Answers

Answer:

7?

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

A rectangle has a width of 12. 5 m and a length of 105 m. What is the effect on the perimeter when the dimensions are multiplied by 2? The perimeter is increased by a factor of 2. The perimeter is increased by a factor of 21. The perimeter is increased by a factor of 25. The perimeter is increased by a factor of 92.

Answers

The perimeter of the rectangle is got increased by a factor of 2. The correct option is A.

What is a rectangle?

It is a polygon that has four sides. The sum of the internal angle is 360 degrees. In rectangle opposite sides are parallel and equal and each angle is 90 degrees. And its diagonals are also equal and intersect at mid-point.

Given

A rectangle has a width of 12.5 m and a length of 105 m.

We know the perimeter of the rectangle is given by

Perimeter = 2 (Lenght + Width)

Let x be the length and y be the width. Then

Perimeter = 2 (x + y)

If the dimensions are multiplied by 2. Then the effect on the perimeter will be

Perimeter = 2 (2x + 2y)

Perimeter = 2 [2 (x + y)]

The perimeter is increased by a factor of 2.

Thus, option A is correct.

More about the rectangle link is given below.

https://brainly.com/question/10046743

You’ve analyzed each game. Which game earns you more points?
A: game 1 ( 200 points per hit)
B: game 2 (points double on each hit)
C: It depends
Explain your answer.

Answers

Answer:

Game 2

Step-by-step explanation:

Each hit the points would double (point(x2))

Example:

1x2=2, 2x2=4, 4x2=8, 8x2= 16, 16x2=32, and so on.

Answer:

It Depends

Step-by-step explanation:

Sample Answer: For up to 11 hits, Game 1 gives the player higher scores. But for 12 or more hits, Game 2 does. That's because exponential growth eventually exceeds linear growth.

A steel company sells 144 tons of steel every 3 years.

At this rate, what is the unit rate for the amount of steel sold every year. You can make a ratio table to help you think through this problem.

Answers

Answer:

48 tons of steel per year

Step-by-step explanation:

you can make it a ratio problem but you can also divide it

144 tons : 3 years

? : 1 year

take 144/3 and you get

48 tons

so

48 tons : 1 year

Answer:

Unit rate= 36

Step-by-step explanation:

Divide 144 by 4 and you get 36. So, the steel company made 36 tons of steel in 1 year and made 144 tons of steel in 4 years

Find the perimeter of the figure.

Answers

Answer:

36 in.

Step-by-step explanation:

The perimeter is the sum of the length of all the sides.

Perimeter of the figure

= 8 +8 +4 +6 +10

= 36 in

m +0.05m = 5.46
plsss help (15 points)

Answers

m=5.2

Add the m and 0.05
1.05m=5.46
Divide both sides by 1.05
m=5.2

find the area of each rectangle 8 ft and 4.2 ft​

Answers

If im correct the answer should be 33.6
If need be multiply. Hope this helps
It is 33.6 because to find the area you multiply length x width which is 8 and 4.2 so the answer is 33.6.

A moving box is 1 meter wide, 1/2 meter long, and 3/4 meter tall. How many cubic meters can the box hold?

Answers

3/8 cubic meters, hope it helps and sorry if it’s incorrect!

At 3:00 PM a man 5 ft tall casts a shadow 19.5 ft long. At the same time, a tree nearby casts a shadow 93.6 ft long. How tall is the tree?

Answers

79.1

19.5 minus 5 equals 14.5 so the shadow is 14.5 more then the actual thing.
subtract 14.5 from 93.6 and you get 79.1


Tbh im not sure how a tree can be 79.1 feet tall but thats what i got from the question. Math class does that sometimes lol.

200 divided by 30,000

Answers

200 divided by 30,000 equals

"0.00666666666"

hope this helps!

Answer: 0.006666667 = 1/150

Step-by-step explanation: Reduce the fraction 200/30,000 to lowest terms by extracting and canceling out 200.


Solve for the variable and express the answer in set notation.
5x - 4 = 11

Answers

Answer: The answer is x=3

Step-by-step explanation:

Let's solve your equation step-by-step.

5x−4=11

Step 1: Add 4 to both sides.

5x−4+4=11+4

5x=15

Step 2: Divide both sides by 5.

5x

5

=

15

5

x=3

Answer:

x=3

What is the equation of the line that passes through the point (−8,−7) and has a slope of 1?

Answers

Answer:

y = x + 1

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

here m = 1 , then

y = x + c ← is the partial equation

To find c substitute (- 8, - 7 ) into the partial equation

- 7 = - 8 + c ⇒ c = - 7 + 8 = 1

y = x + 1 ← equation of line

Find the solutions to the given system of equations: x^2+ y^2= 5 and y=3x + 1

Answers

I don’t really know I just have to answe a question

ABC is a right angled triangle AC=18 angle ACB=37 calculate the length of AB

Answers

Answer:

10.8

Step-by-step explanation:

sin(37) =AB/AC

Since AC=18

AB= 18sin(37)

Therefore AB=10.8

Question 9
In △QRS , ∠R is a right angle and the measure of ∠S is 22° .

(image below)

Which equation can be used to calculate the measure of ∠Q ?

A
x+22=180

B
x+22=90

C
22−x=180

D
22−x=90

Answers

Answer:

i think the answer is b

because,

if x+22=90

x=90-22=68

we know that the sum of the three angles of a triangle is 180

so, that means

90+22+68 should be 180

and it is 180, so the answer must be b

Solve this pls ✨ my teacher is crazy she give us so much work

Answers

Answer:

The photo

Step-by-step explanation:

All is wreaten in the photo

At a nut shop, a 3-pound bag of cashews costs $39, and a 5-pound bag of almonds costs $55. What is the cost per pound for each type of nut? Show your work.

Answers

$13 per pound bag of cashew
$11 per pound bag of almonds

show work:
Cashews: $39/3 = 13/1 or $13 per bag
Almonds: $55/5 = 11/1 or $11 per bag

which statement best explain best explains whether the table represents a linear or non linear function (100 POINTS) HURRYYYY PLSSS

Answers

Answer:

It is a linear function because there is a constant rate of change in both the input and output values

Step-by-step explanation:

To determine if the function is linear, calculate the differences between the y values.

If the differences are constant, or the same value, the equation is linear and has a constant slope. If the differences are not the same, the equation is not linear.

difference between y values (output)

7 - 4 = 3

3 - 1 = 3

1 - -2 = 3

⇒ the function is linear

difference between x values (input)

-2 - -5 = 3

-5 - -8 = 3

-8 - -11 = 3

⇒ the function is linear as there is a constant rate of change in both the input and output values

Chris can read 50 pages of a book in 1 ½ hours. Based on this rate, how many pages will he read in 4 ½ hours?

Answers

Answer:

150

Step-by-step explanation:

50pg=1.5h multiply both by 3 to get 4.5 hours 50x3=150

Answer: 150

hope this helped :)

how do i solve for x in x/9=6

Answers

Answer:

x = 54

Step-by-step explanation:

Solve for x by simplifying both sides of the equation, then isolating the variable.

In a class test , 3 marks are awarded for every correct answer and (-2) marks are awarded for every incorrect answer and no marks for not attempting any questions. ( find the following given below ).

1) Irine scored 20 marks . if she has got 12 correct answers , how many questions has she attempted incorrectly ?

2) Chloe scored (-5) though she has got 7 correct answers . how many questions has she attempted not correctly ? ​

Answers

[tex]\huge\sf {solution}[/tex]

#1

Marks awarded for onecorrect answers = 3 Marks awarded for 12 correct answers = 3 × 12 = 36 Marks obtained for incorrect answers = 20 - 36 = -16 Marks given for 1 incorrect answer = -2

Therefore, ( - 16 ) ÷ ( - 2 ) = 8

hence , irene has attempted 8 questions incorrectly

#2

Marks scored by chloe for 7 correct answers = 3 × 7 = 21 chloe scored = -5 Marks obtained for incorrect answers = -5 - 21 = -26 Marks awarded for 1 incorrect answer = -2

Therefore , number of incorrect answer = -26 / -2 = 13

hence , chloe has attempted 13 questions not correctly

Hope it helps ( ╹▽╹ )~

For new customers, there is an additional one-time $100 service fee. Repeat the previous problem for new customers.



Complete the equation below

Answers

Answer:

y = 70x

Step-by-step explanation:

y=70x+100 you would get y = 70x

39=7(mod 8)
Is the above statement true or false?

Answers

Answer:

True

Step-by-step explanation:

39/8 = 4.875

8*4 = 32

Therefore, 39 - 32 = 7

It’s true hope I this helped

The vans store originally cost $65. It is now on sale for $45.50. What is the percent of decrease or discount?

Answers

Answer:

the amount of decrease is 30%

Answer:  30

Step-by-step explanation:

$19.50 discount

discount percentage 30%

I need help find the value of x?

Answers

Add the two angles and then subtract from 180* to find the missing angle

So,

145* + 15* = 160*

180* - 160* = 20*

Answer: x = 20*

2. Explain how to calculate 8% of 350 by first calculating 1% of 350. Answer:

Answers

Answer:

$28

Step-by-step explanation:

Find 1% of $350:

$350*1/100 = $3.5

Find 8% of $350:

$3.5*8 = $28

Here are the steps

First find 1% of 350Then multiply with 8/1=8 times with 1%

Lets do

[tex]\\ \tt\longmapsto 0.01(350)=3.50[/tex]

Multiply with 8

[tex]\\ \tt\longmapsto 8(3.50)=24.00+4.00=28.00\$[/tex]

Find the equation of the exponential function represented by the table below:

Answers

Answer: y= 5(2)^x

Explanation: The first number is when x=0. This would be 5 (y)
The number in the parentheses is the pattern in the table. 5 divided by 2 is 2.5 and 2.5 divided by 2 is 1.25 and so on. Then the number in the parentheses is always to the power of x

Byron is a wealthy tycoon who makes his money buying and selling stocks. This is an example of _____ income. A. Capital gains b. Earned c. Hourly d. Passive Please select the best answer from the choices provided A B C D.

Answers

Answer:

The answer would be A.

Hope this helped :D

Answer:

It is A

Step-by-step explanation:

Emma is an artist and has created seven paintings

Answers

Answer:

what is the rest?

Step-by-step explanation:

Tell Emma I said congrats
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