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
goblinko [34]
2 years ago
9

If 2a+4b=5 and a is equal to three times b, what is 3a?

Mathematics
1 answer:
IrinaK [193]2 years ago
7 0

Answer:

3a=4.5

Step-by-step explanation:

it says that "a is equal to 3 times b", which translates to a=3b

We can substitute a as 3b in 2a+4b=5

2(3b)+4b=5

multiply

6b+4b=5

add

10b=5

divide by 10

b=1/2

since it's given that a=3b, we can multiply 1/2 by 3

a=3/2

3a is 3 times a, so we can mutiply 3(3/2)=9/2=4.5

Hope this helps!

You might be interested in
Three glasses of milk and 4 snack bars have a total of 89 carbohydrates​ (carbs), and 4 glasses of milk and 3 snack bars have a
EleoNora [17]

Answer:

There are  15 carbs in each glass of milk and  11 carbs in each snack bar.

Step-by-step explanation:

Let us assume:

The carbs in  each glass of milk  = x

The carbs in each snack bar = y

So, the carbs in 3 glass of milk = 3 ( Carbs in 1 glass of milk )  = 3 x

and the carbs in 4 snack bars  = 4 ( Carbs in 1 snack bar)  = 4 y

⇒ 3 x + 4 y = 89

Similarly, the carbs in 4 glass of milk = 4 ( Carbs in 1 glass of milk )  = 4 x

and the carbs in 3 snack bars  = 3 ( Carbs in 1 snack bar)  = 3 y

⇒ 4 x + 3 y = 93

Solving the given system of equation:

3 x + 4 y = 89     ............(1)

4 x + 3 y = 93    ............. (2)

Multiply equation (1) with (-4) , and (2) by 3 and add both equation.

-12 x - 16 y + 12 x + 9 y = -356 + 279

or, - 7 y = -77

⇒ y =  77 / 7 = 11 , or y  =   11

Putting this in (1) , we get  3 x  + 4y = 89

⇒ 3 x  + 4(11) = 89  or,  3 x =  89 - 44 = 45

or, x = 45/3  = 15

⇒ x = 15

Hence, there are  15 carbs in each glass of milk.

There are  11 carbs in each snack bar.

4 0
3 years ago
Jasmine is buying beans. She bought r pounds of red beans that cost $3 per pound and b pounds of black beans that cost $2 per po
Levart [38]
D and B are the answers because they are the variables.
4 0
3 years ago
What is a domain mathamatics
dalvyx [7]

Answer:

In mathematics, the domain or set of departure of a function is the set into which all of the input of the function is constrained to fall. It is the set X in the notation f: X → Y, and is alternatively denoted as. . Since a function is defined on its entire domain, its domain coincides with its domain of definition.

Step-by-step explanation:

Google

5 0
3 years ago
Read 2 more answers
9. Jonathan can rent an unfurnished apartment for
kenny6666 [7]

The furnished apartment would be $760 altogether whereas the furnished apartment would be $1,800

3 0
3 years ago
31.) State the slope of the line shown below.
Murljashka [212]
The answer is undefined


The slope of a line can be positive, negative, zero, or undefined. A horizontal line has slope zero since it does not rise vertically (i.e. y1 − y2 = 0), while a vertical line has undefined slope since it does not run horizontally (i.e. x1 − x2 = 0).
5 0
3 years ago
Other questions:
  • 2x2-9x+1=0 value of discrimination and number of real solutions
    14·1 answer
  • The half-life of a radioactive substance is 12 days. After 11 days a sample of the substance has been reduced to a mass of 7 mg.
    14·2 answers
  • Complete the equation of the line through (-9,-9) and (-6,0) y=?
    7·2 answers
  • Write the equation of a horizontal ellipse with a major axis of 30, a minor axis of 14, and a center at (-9, -7
    6·1 answer
  • #7 HELP ! WILL GIVE BRANLIEST
    6·1 answer
  • 7) Find the sample standard deviation. 22 29 21 24 27 28 25 36​
    11·1 answer
  • What is the exponential function (0,25) (1,50) (2,100) (3,200) (4,400)
    12·1 answer
  • Write in standard form. (Use Desmos)* 9.76x10 with a 5 on top of the ten​
    10·1 answer
  • 1) When graphing a line from an equation, the first point to plot is the ​
    10·1 answer
  • A softball player throws a ball into the air with an initial velocity of 32 feet per second. The ball is released at a height of
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!