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
Yuri [45]
3 years ago
11

*WILL MARK BRAINLIEST*

Mathematics
2 answers:
LenaWriter [7]3 years ago
4 0

The text itself determined how to solve the problem.

Namely, two object are given in two relations and we conclude that we have two variables that we present with two equations.

We will take hardcover books as x and paperbacks as y.

First equation is  4x+10y=64

Second equation is  5x+7y=58

This is system of two linear equations with two variables

To solve this system we will use Gaussian agorithm with which we make

gradual elimination of the variables.

We will multiply first equation with number 4 and second with number (-5)

and get

20x+50y=320   and   -20x-28y=-232

When we add first equation to another we get

variable x is eliminated  

50y-28y=320-232 => 22y=88 => y=88/22=4

y=4  when we replace variable y in the first equation before multiplying

we get  4x+10*4=64 => 4x+40=64 => 4x=64-40 => 4x=24 => x=24/4=6

x=6

Total charge for hardcovers is  => 4x+5x=9x=9*6=54$

Total charge for paperbacks is => 10y+7y=17y=17*4=68$

Good luck!!!



olchik [2.2K]3 years ago
4 0

Answer:

The text itself determined how to solve the problem.

Namely, two object are given in two relations and we conclude that we have two variables that we present with two equations.

We will take hardcover books as x and paperbacks as y.

First equation is  4x+10y=64

Second equation is  5x+7y=58

This is system of two linear equations with two variables

To solve this system we will use Gaussian agorithm with which we make

gradual elimination of the variables.

We will multiply first equation with number 4 and second with number (-5)

and get

20x+50y=320   and   -20x-28y=-232

When we add first equation to another we get

variable x is eliminated  

50y-28y=320-232 => 22y=88 => y=88/22=4

y=4  when we replace variable y in the first equation before multiplying

we get  4x+10*4=64 => 4x+40=64 => 4x=64-40 => 4x=24 => x=24/4=6

x=6

Total charge for hardcovers is  => 4x+5x=9x=9*6=54$

Total charge for paperbacks is => 10y+7y=17y=17*4=68$

Good luck!!!

Step-by-step explanation:

You might be interested in
Sophia is baking 5 batches of muffins. Each batch uses 4 teaspoons of sugar for the topping and more sugar for the batter. Sophi
Jobisdone [24]

Answer:

Your answer is B

5 0
3 years ago
Read 2 more answers
Mrs. CADY CONSTRUCTS A CUBE WITH 512 MAGNETIC BLOCKS. STUDENTS IN HER TWO CLASSES WILL EACH MAKE AN IDENTICAL CUBE. THERE ARE 28
Lilit [14]
YOU DON"T HAVE TO YELL

512 PER STUDENT

BASICALLY,
CUBES NEEDED=CUBES PER STUDENT TIMES NUMBER OF STUDENTS

NUMBER OF STUDENTS=28+25=53

CUBES PER STUDENT=512

CUBES NEEDED=512 TIMES 53 EQUALS 27136 CUBES


SHE NEEDS 27136 CUBES FOR ALL HER STUDENTS
8 0
3 years ago
Write an expression for the following statement(s), and then list each operation
NeX [460]
Let's assign variables for the unknowns. Let x be the amount of total sales while x is the amount of net sales. It is called net sales because a percentage is still deducted from it. The equation will be written as:

Net Sale = Total Sales - 0.25*Total Sales
y = x - 0.25x
y = 0.75x
4 0
2 years ago
Select all of the following ordered pairs that are in the solution set of the inequality shown.
Ilya [14]

Answer:

points on the boundary line: (0, 10), (20, 0)

solution points not on the boundary line: (100, 100)

Step-by-step explanation:

We cannot tell from the posted picture whether the boundary line is solid or dashed, so the answer above is split into two parts. If the boundary line is solid (x+2y≥20), all three listed points are in the solution set. If the boundary line is dashed (x+2y>20), only (100, 100) is in the solution set

5 0
3 years ago
What is the value of 2.5 - 14.3 (-18.2)?
julia-pushkina [17]

Answer:

262.76

Step-by-step explanation:

We must follow our order of operations here, which tell us to multiply before we subtract.

-14.3 • (-18.2) = 260.26

Then we can look at what's left:

2.5 + 260.26

Work that out to get your answer, 262.76

6 0
3 years ago
Other questions:
  • a doggie daycare charges $21.50 per day if you leave your dog 5 days a week the discount is 20% what is the cost of leaving your
    8·1 answer
  • Solve 5x(68-75/98)+y=2
    9·1 answer
  • Sally bought 6.11 pounds of cheese at the deli. Dan bought 3.68 pounds of
    15·1 answer
  • An athlete runs 1 mile along a normal 400m athletic track and finishes exactly on the finish line. Where did he start from? ( 1
    14·1 answer
  • Help please this is making me lose braincells- Giving brainliest
    6·1 answer
  • Can someone check those and tell what is wrong and the answer
    15·1 answer
  • Scale factor 3/4 Coordinates A(1,12) B(1,6) C (0,9) Triangle DEF is a dilation of triangle ABC What's the coordinates of triangl
    6·1 answer
  • Trevon bought 8 pairs of pants for a total of $520. Dress pants cost $80 and jeans cost $40. How many pairs of jeans did he buy?
    11·2 answers
  • What does factoring a polynomial involve?
    8·1 answer
  • A shop increases all their prices by 9% A picture frame increases by £153 Find the new price of the picture frame.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!