1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
olya-2409 [2.1K]
3 years ago
5

two times a number added to another number is 20. three times the first number minus the other number is 20. find the numbers

Mathematics
1 answer:
skelet666 [1.2K]3 years ago
8 0

Answer:

y=7

Step-by-step explanation:

We have two numbers,  

x

,

y

. We know two things about them:

2

x

+

y

=

25

3

x

−

y

=

20

Let's add these two equations together which will cancel the  

y

:

5

x

+

0

y

=

45

x

=

45

5

=

9

We can now substitute in the  

x

value into one of the original equations (I'll do both) to get to  

y

:

2

x

+

y

=

25

2

(

9

)

+

y

=

25

18

+

y

=

25

y

=

7

3

x

−

y

=

20

3

(

9

)

−

y

=

20

27

−

y

=

20

You might be interested in
An airplane flies with a constant speed of 620 miles per hour. How long will it take to
LekaFEV [45]

Answer:

30 minutes

Step-by-step explanation:

Alright lets start by laying out what the problem gives us :

A plane flies 620 mph.

It is asking how long it will take to travel 310 miles.

We need to give our answer in minutes or hours.

So lets take mph and look at the full meaning "Miles per hour"

An hour has 60 minutes in it.

So really it is saying miles per 60 minutes as well as miles per hour

So you could say the plane is traveling 620 miles every 60 minutes.

So now lets look at the number 310.

Just looking at it I can tell you that 310 looks very close to half of 620, in fact it is exactly half!

So lets divide the 620 mph by the 310 miles it is asking and we get 2! Proving that 310 is half of 620.

Alright now lets divide both the number of miles and number of minutes :

620 miles per 60 minutes

divided by 2 both miles and minutes

310 miles per 30 minutes

So this is your answer. After this you get that it would take 30 minutes to travel 310 miles in a plane going 620 miles per hour!

I hope this helps and I could help you understand it. :)

If you have any questions feel free to comment or dm me.

7 0
2 years ago
The angles of a triangle are 80º, 2x + 2º, and 5xº. What is the value of x?
Lady bird [3.3K]
If you add 5x to 2x+2 you will get 7x+2. You would set this equation equal to 80, so it would be 7x+2=80. When you solve this you will get 11.1428571429, which can be rounded to 11, 11.1, or 11.14, whichever you prefer. 

3 0
3 years ago
Convert 8/20 to a percent​
nikitadnepr [17]

Answer:

40%

Step-by-step explanation:

8/20

Divide it to get a decimal.

8/20 = 2/5 = 0.4

Change the decimal into a percent by moving the decimal point 2 places to the right.

0.4 = 40%

7 0
3 years ago
A quadrilateral has diagonals that are congruent and bisect opposite pairs of
gtnhenbr [62]
If the diagonals of a quadrilateral are perpendicular, then it is a rhombus. False, diagonals don't have to be congruent or bisect each other. The diagonals of a rectangle bisect its angles. A kite with all consecutive angles congruent must be a square.
8 0
3 years ago
Write a situation that can be represented by the algebraic expression $3.50t
nignag [31]
$3.50 being the amount the item <em>t</em> costs and <em>t</em> being the number of this item.
6 0
3 years ago
Other questions:
  • How much is 134×134=
    14·2 answers
  • Select all pairs of corresponding angles. Assume the lines are parallel.
    10·2 answers
  • Which linear equality will not have a shared solution set with the graphed linear inequality? y &gt;2/5 x + 2 y &lt;-5/2 x – 7 y
    6·2 answers
  • Value of f(-3) and g(3) and if f(x)= -6x+3 and g(x) =3x+21x-3
    6·1 answer
  • Another geometry question! Help!
    8·1 answer
  • Find the volume help ASAP
    6·2 answers
  • <img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B%20-%202%20%2B%203%20%5Ctimes%206%7D%205" id="TexFormula1" title=" \frac{ - 2 + 3
    11·2 answers
  • What is the solution to 4(x+2)&gt;8x-3
    6·2 answers
  • 8 - (3 + b) = b - 9<br> please show work
    5·1 answer
  • The graph of y = f ′(x), the derivative of f(x), is shown below. List the intervals where the graph of f is concave down.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!