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agasfer [191]
3 years ago
7

У = 2х 3х + Зу = -18

Mathematics
2 answers:
eimsori [14]3 years ago
8 0
<h2>y = -4</h2><h2>x = -2</h2>

<h2>________________________</h2>

Step-by-step explanation:

y = 2x

<h3>y÷2 = x</h3>

<h2>------------------------------------------</h2>

so,

3x + 3y = -18

3(y÷2) + 3y = -18

3y ÷2 + 3y = -18

( 3y + 6y )÷2 = -18

9y ÷2 = -18

9y = -18 ×2

9y = -36

<h3>y = -4</h3>

<h2>-----------------------------------------</h2>

x = y÷2

x = -4÷2

<h3>x = -2</h3>

<h2>follow me</h2>

Troyanec [42]3 years ago
3 0

Answer:

x=-2,y=-4

Step-by-step explanation:

Substuting the value of y in second equation.

3x+3×2x=-18

9x=-18

x=-2

putting the value of x in equation 1 ,

y=-4

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If 32 + 8x is 20 more than 28, what is the value of 4x?
pashok25 [27]

Answer

32+8x=28+20

32+8x=48

-32       -32

8x=16

/2     /2

4x=8

(Brainlest PLz and rate 5 stars plz) I would appreciate it.

Step-by-step explanation:

6 0
3 years ago
Match the solution set given in inequality notation with the solution set given in interval notation.
sasho [114]

Answer:

x≤7.8  ⇒(-∞;7.8]

x<7.8  ⇒ (-∞;7.8)

x>7.8  ⇒ (7.8; ∞)

x≥7.8  ⇒ [7.8; ∞)

Step-by-step explanation:

Hi, to answer this question we have to analyze each expression:

• x≤7.8

The solution is all the numbers less or equal to 7.8, since it can be equal to 7.8, it includes 7.8 , we have to use closed brackets

(-∞;7.8]

• x<7.8

All the numbers less than 7.8 , it excludes the endpoint , it's an open interval (parenthesis)

(-∞;7.8)

• x>7.8

All the numbers higher than 7.8, open interval (parenthesis)

(7.8; ∞)

• x≥7.8

All the numbers higher or equal to 7.8, closed interval (closed brackets for the endpoint)

[7.8; ∞)

4 0
3 years ago
What is the area in square meters of 6 triangles. how many triangles are needed to compose a region that is 1 1\2 square meters?
Delicious77 [7]

To create an area that is 1.5 m^2   in size, you will need to make use of a total of 27 triangles.

<h3>How many triangles are needed to compose a region that is 1.5 square meters?</h3>

A square that has a size of one square meter is divided into nine smaller squares that are similar to each other. Each of the little squares is divided into two triangles that are similar to one another.

There are nine smaller squares contained inside one square meter, since 1 square meter may be broken down into nine identical smaller squares. Each of the little squares is divided into two triangles that are similar to one another. 9 smaller squares may be broken down into the following:

9*2=18 (shows identical triangles)

Hence, 1 square meter is decomposed into 18 identical triangles.

We need to find the number of triangles needed to compose a region that is square meters

where

m^2 = 1.5 m^2

Where

1 m^2 = 18 identical triangles.

1.5 m^2 = 1.5 * 18

1.5 m^2  = 27 identical triangles.

In conclusion, To create an area that is 1.5 m^2   in size, you will need to make use of a total of 27 triangles.

Read more about the area

brainly.com/question/27683633

#SPJ1

8 0
2 years ago
Which number produces an irrational number when added to 0.4
elena-14-01-66 [18.8K]
Any other irrational number. 0.4 is rational (ie., it can be written as a fraction), but rational+irrational is always irrational.

So examples would be π or √2. If you add those, the result is irrational.
6 0
4 years ago
NEED HELP ASAP!! RESPOND AS QUICK AS POSSIBLE!!!
chubhunter [2.5K]

Answer:

d

Step-by-step explanation:

google

4 0
3 years ago
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