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
Rudik [331]
3 years ago
13

Julio bought 4 pencils and 3 erasers for $0.37 and David paid $0.33 for 3 pencils and 4 erasers. What is the cost of one pencil?

What is the cost of one eraser?
Mathematics
1 answer:
grigory [225]3 years ago
4 0

cost of pencil = x = 0.07

and cost of eraser = y = 0.03

Step-by-step explanation:

let cost of pencil = x

and cost of eraser = y

So, we have equations:

4x+3y=0.37\\3x+4y=0.33

Solving both equations to find value of x and y

Let:

4x+3y=0.37\,\,\,eq(1)\\3x+4y=0.33\,\,\,eq(2)

Multiply eq(1) with 4 and eq(2) with 3 and subtract

16x+12y=1.48\\9x+12y=0.99\\-\,\,\,-\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,-\\--------\\7x=0.49\\x=0.07

Putting value of x in equation 1:

4x+3y=0.37\\4(0.07)+3y=0.37\\0.28+3y=0.37\\3y=0.37-0.28\\3y=0.09\\y=0.03

So, x= 0.07 and  y = 0.03

cost of pencil = x = 0.07

and cost of eraser = y = 0.03

Keywords: System of equations

Learn more about system of equations at:

  • brainly.com/question/9045597
  • brainly.com/question/3739260
  • brainly.com/question/13168205

#learnwithBrainly

You might be interested in
This is number three Nd I neeed help with this I can help you with anything
KATRIN_1 [288]

Answer:

a. False

b. False

c. True

d. True

e. True

5 0
3 years ago
Move the numbers to the blanks to order them from least to greatest value.
pishuonlain [190]

Answer:

-2.12 -089 0.4 9/8

Step-by-step explanation:

im good at fractions

6 0
3 years ago
Read 2 more answers
PLZ HELP ASAP!!!!! <img src="https://tex.z-dn.net/?f=" id="TexFormula1" title="" alt="" align="absmiddle" class="latex-formula">
AveGali [126]

The simplified expression of  $4 x \cdot \frac{1}{x^{-5}} \cdot x^{-3} is 4x^3.

Solution:

Given expression is 4 x \cdot \frac{1}{x^{-5}} \cdot x^{-3}.

To simplify the given expression.

$\Rightarrow4 x \cdot \frac{1}{x^{-5}} \cdot x^{-3}

Using exponent rule: \frac{1}{a^{-m}}=a^m

$\Rightarrow4x \cdot x^{5}.x^{-3}

Using another exponent rule: a^m \cdot a^n=a^{m+n}

$\Rightarrow4x \cdot x^{5-3}

$\Rightarrow4x \cdot x^{2}

Using exponent rule: a^m \cdot a^n=a^{m+n}

$\Rightarrow4x^{1+2}

$\Rightarrow4x^3

Hence the simplified expression of  $4 x \cdot \frac{1}{x^{-5}} \cdot x^{-3} is 4x^3.

8 0
3 years ago
Help pls! this is due tonight. thanks!
erma4kov [3.2K]

Answer:

Neon: 0

Oxide:  -2

Copper:   2

Tin:  0

Step-by-step explanation:     To solve you must add/subtract the numbers to get the charge, for example if its -30 charge from electrons and 10 charge from protons, -30 + 10 = -20     therefore the charge is -20

6 0
3 years ago
Read 2 more answers
What is a bird favorite type math
Dimas [21]

Answer:

word problems

Step-by-step explanation:

A random guy made 100 bird houses and each bird house has 100 seeds how many seeds are there in total 100,000

6 0
3 years ago
Other questions:
  • Write and solve an equation to find the value of each variable
    7·1 answer
  • Convert 2845 inches per second to miles per hour. Round to one decimal place.
    7·1 answer
  • Which of the following type of income should a budge be based on
    14·1 answer
  • Solve (6 1/6 -2 5/6)x3
    8·1 answer
  • F(x) = 4x ; find f(-15)
    14·1 answer
  • What is the following number in decimal form?
    5·1 answer
  • What is the value of the rational expression below when x is equal to 4? x+20/x+4
    8·1 answer
  • How many 1 ft by 1ft tiles would it take to cover the Washington Monument?
    15·2 answers
  • Solve for c.
    15·2 answers
  • Somebody please help me solve this I’m stuck
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!