Mathematics High School

solve the following systems of equations by elimination

- 2x - 5y=-27
- 2x + 3y = 13​

Answers

Answer 1

Answer:

x= 1

y- 5

Step-by-step explanation:

okay so you know the rules...

we need to eliminate one variable to solve this system so first...

im going to get rid of x first to do so i need to...

multiply any of the equation by negative one to get it to a positive to eliminate

-2x - 5y= -27

( -2x + 3y= 13) -1

-2x -5y= -27

2x -3y= -13   follow the rules of signed integers

we eliminate x and have this left

-5y= -27

-3y= -13    use the second rule of elimination....add the rest up

-8y= -40   divide both sides by -8

y= 5

we arent done yet we need to find the other variable

plug in y to one of the equations like this...

-2x - 5(5)= -27

-2x - 25= -27   add -25 to both sides to get the variable by itself

-2x= -2   divide both sides by -2

x= 1

Hope this helped!

Related Questions

Evaluate 13-0.75w+8x13−0.75w+8x13, minus, 0, point, 75, w, plus, 8, x when w=12w=12w, equals, 12 and x=\dfrac12x= 2 1 ​

Answers

Answer:

the value of the given equation is 8

Step-by-step explanation:

The computation is shown below

Given that

13 - 0.75w + 8x

here w = 12

x = 1 ÷ 2

Now put these values to the above equation  

= 13 - 0.75 × (12) + 8 × (1 ÷ 2)

= 8

Hence, the value of the given equation is 8

What is the correct answer?

Answers

Answer:

D.

Step-by-step explanation:

They would charge a flat fee of $1000, and $200 per room

A building is 720 feet tall. The scale model of that building is 18 inches tall.
Find the scale factor of the model to the actual building

Answers

Answer:

720ft= 8640in => 18/8640 =0.002083 = 2083/1000000

Step-by-step explanation:

Solve this equation:
3x - 5x + 8 - 3x = -5X -8

Answers

3x-5x+8-3x=-5x-8

3x+ -5x+8+ -3x=-5x+ -8

(3x+ -5x+ -3x)+ (8)=-5x-8

-5x+8= -5x - 8

-5x+8+5x= -5x - 8+5x

8=-8

8-8= -8 - 8

0= -16

Can someone actually help with this not traditional reference angle question please I will give lots of points and will make you Brainliest

Answers

Answer:

Step-by-step explanation:

β ∈ { 0° , 18° , 180° , 198° }

Y'all someone pls help me :(

Answers

Answer:

Yes, the table does show a function. First, just by seeing that the y values are the same, this means that this is a perfectly horizontal line. Horizontal lines are functions, but vertical lines aren't. I suppose the ordered pairs are just (-2,5), (0,5), and (3,5)

Round 453,605 to the nearest thousand

Answers

Answer:

453,000

Step-by-step explanation:

Write an equation for the n th term of the arithmetic sequence 23, 16, 9, 2, ... . Then find a 25

Answers

Answer:

yes u got it right

Step-by-step explanation:

Is it bad to have a math assignment you don't get?

Answers

Answer:

Yes, if yo get an assignment that you don't get, ask the teacher to explain it to you.

Step-by-step explanation:

Um no it’s not you probably didn’t need that.

Write equations for the vertical and horizontal lines passing through the point (-9,-4).

Answers

Answer:

for a vertical line the value of x, in this case 9, will never change. this will be true for any value of y. therefore the equction for vertical line line passing through this point is; x=9 likewise, for a horizontal line the value of y, in this case -4 will never change. this will be true for any value of x. therefore the equation for a horizontal line passing through this points is; y=-4

Step-by-step explanation:

hope this helpful and you welcome!

tell me if you have anything to help you with.

PLEASE HELP



All of the following are rational except
O 3.14159...
o o
O 0.125
00

Answers

Answer:

3.14159...

Step-by-step explanation:

pi is not rational number

Answer:

A. 3.14......

Step-by-step explanation:

3.14159 is called pi! Pi is not rational, it is irrational.

Item 3
Question 1
Solve a/−5 > 1. Graph the solution.

Answers

Answer:

: x < 6

Step-by-step explanation:

What does the graph look like for the equation y=|x+3|

Answers

Answer:

Step-by-step explanation:

Please help will mark brainliest


In a right triangle, if a = 15m, c = 39m, what is b?

Answers

Answer:

b=36m

Step-by-step explanation:

im not sure tho

What is the measure of A 54°
D. 66°
B. 56°
E. 114°
C. 58°

Answers

Answer:

66 I think might he wrong

Step-by-step explanation:

I'm not sure if its right

I’m pretty sure it’s 66 Becuase whatever u do to one side u do the other ‍♂️

what single decimal multiplier would you use to increase by 14% followed by a 1% decrease? ​

Answers

Answer:

1.1286

Step-by-step explanation:

Increasing something by 14% is the same as taking 114% of it, and decreasing it by 1% is the same as taking 99% of it. 114% is 1.14 as a decimal, and 99% is 0.99 as a decimal, so multiplying the two together, we get the single decimal

1.14 · 0.99 = 1.1286

12.86% or a multiplier of 1.1286.

Assume the number 100.

100(1.14)=114
114(0.99)=112.86

What is the value of x in the solution to the this system of equations:
y=-1/2x + 2
y - 2x = -3

Answers

Answer:

x=2 and y=1

Step-by-step explanation:

hope this helps!

Answer:

x = 2

Step-by-step explanation:

For system of equations, you need to equal them to each other. First, you need to isolate y on one side of the equation in [tex]y - 2x = -3[/tex]

[tex]y = -3 + 2x[/tex]

Now, equal the equations to each other:

[tex]-\frac{1}{2}x + 2 = -3 + 2x[/tex]

Add [tex]\frac{1}{2} x[/tex] to both sides of the equation:

[tex]2 = -3 + (2x + \frac{1}{2}x) = -3 + (\frac{4}{2}x + \frac{1}{2}x) = -3 + \frac{5}{2} x[/tex]

Subtract add 3 to both sides of the equation:

[tex]5 = \frac{5}{2}x[/tex]

Divide [tex]\frac{5}{2}[/tex] on both sides of the equation. Remember: when you divide a fraction, you multiply by the reciprocal. See below:

[tex]\frac{2}{5} * 5 = x[/tex]

[tex]\frac{10}{5} = x[/tex]

[tex]x = 2[/tex]

Check your work:

[tex]-\frac{1}{2}(2) + 2 = -3 + 2(2)[/tex]

-1 = -1

Simplify. [3 • (3 – 9)] + 9 –4.5 9 45 –9

Answers

this is your answer   -45189/2000

Plz plz I need help plz plz really fast plz plz I will cry if u help me giving 25points

Answers

Answer:

[tex]\frac{1}{3}[/tex]

Step-by-step explanation:

help plz it's not dark blue

Answers

Answer:

YELLOW

Step-by-step explanation:

MY TEACHER MADE ME DO THIS LOL

Help please urgent please

Answers

Answer:

DEA

Step-by-step explanation:

adjacent is next to and DEA is on line CF with CED

Pls help and SHOW workings

Answers

Answer:

94 = m∠1

Step-by-step explanation:

32 + 62 = m∠1

94 = m∠1

HELP WORTH 50 POINTS ILL GIVE U BRAINLESS IF UR RIGHT

5.1 x 10^-3 – 1.8 x 10^-3
in scientific notation (evaluate)

Answers

Answer:

[tex]3.3*10^{-3}[/tex]

Just like last time, you can convert them to their decimal forms, subtract, and convert back!

Hope this helps!

Brainliest please!

Answer:

3.3*10-3

Step-by-step explanation:

i need help plz!?????​

Answers

Answer:

B

Step-by-step explanation:

Answer:

3/5

Step-by-step explanation:

you are looking for the X-Y so X go first

what is the solution to the equation? 2x−4=6

Answers

X= 5, because you will add +4 to both sides, 2x=10, and then you will divide /2 to both sides, which will give you x=5

find the value of x in each of the given triangles.​

Answers

Answer:

7.5

Step-by-step explanation:

10x + 8x + 6x = 180°

24x = 180°

x = 180°÷24

× = 7.5

HOPE IT HELPS YOU.

HOPE IT HELPS YOU.

HOPE IT HELPS YOU.

A manufacturer of cell phone screens has found that 5 percent of all screens produced have defects. Let pd represent the population proportion of all cell phone screens with a screen defect, therefore pd=0.05. For the sampling distribution of the sample proportion of cell phone screens from this manufacturer with a screen defect for sample size 400, μpˆd=0.05. Which of the following is the best interpretation of μpˆd=0.05 ?

For a randomly selected cell phone screen from this population, the mean number of screen defects for the selected screen will be equal to 0.05.

For a randomly selected cell phone screen from this population, the mean number of screen defects for the selected screen will be equal to 0.05.
A

For every sample of size 400 from this population, the proportion of cell phone screens with a screen defect will be 0.05.

For every sample of size 400 from this population, the proportion of cell phone screens with a screen defect will be 0.05.
B

For all samples of size 400 from this population, the mean number of screen defects for the samples is 0.05.

For all samples of size 400 from this population, the mean number of screen defects for the samples is 0.05.
C

For all samples of size 400 from this population, the mean of all resulting sample proportions of cell phone screens with a screen defect is 0.05.

For all samples of size 400 from this population, the mean of all resulting sample proportions of cell phone screens with a screen defect is 0.05.
D

For all samples of size 400 from this population, the standard deviation of all resulting sample proportions of cell phone screens with a screen defect is 0.05.

Answers

Answer:

For all samples of size 400 from this population, the mean of all resulting sample proportions of cell phone screens with a screen defect is 0.05.

Step-by-step explanation:

College Board

Using the Central Limit Theorem, it is found that the correct option is:

C  For all samples of size 400 from this population, the mean of all resulting sample proportions of cell phone screens with a screen defect is 0.05.

By the Central Limit Theorem, for a proportion p in a sample of size n, the mean of the sampling distribution of sample proportions is [tex]\mu = p[/tex], while the standard error is [tex]s = \sqrt{\frac{p(1 - p)}{n}}[/tex

In this problem, the mean of the sampling distribution of sample proportions is 0.05, that is, the mean proportion of all samples, hence, the correct option is C.

A similar problem is given at https://brainly.com/question/16257233

I need help can you help me
equation: 3x = ax +b

Answers

Answer:

a = 3

b = 0

Step-by-step explanation:

Equations that have infinite solutions are equations that equal itself.

Example: 13y = 13y has infinite solutions

We need to find the values of a and b so that it equals 3x.

Therefore, a = 3 and b  = 0.

Need help thanks .....

Answers

d. 5/2! keep in mind that a perpendicular slope is an opposite reciprocal (change the sign and flip the fraction)

A baseball team played 75 games and lost 20% of them. How many games did the team lose?
015
20
O 55
O 60

Answers

Answer:

15

Step-by-step explanation:

20% is 1/5

75*1/5=75/5=15

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