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
nydimaria [60]
3 years ago
12

A used book store is selling 3 records and 5 CDs for $60. You can also buy 6 records and 4 CDs for $80. Find the cost of one CD.

Write the linear system that describes this situation.​
Mathematics
1 answer:
krek1111 [17]3 years ago
5 0

9514 1404 393

Answer:

  3r +5c = 60

  6r +4c = 80

Step-by-step explanation:

There are many aspects of "this situation" that could be described by equations. We are guessing that you want equations that will help you determine the costs of a record and a CD, assuming the costs are the same for each instance of the media.

Let r and c represent the costs of a record and a CD, respectively.

  3r +5c = 60 . . . . . . . the value of the first purchase

  6r +4c = 80 . . . . . . . the value of the second purchase

These equations comprise a linear system describing an aspect of the situation.

_____

<em>Comment on the question</em>

The numbers make no sense, as the cost of a CD is $(6 2/3), the cost of a record is $(8 8/9).

You might be interested in
Find the SIDE LENGTH of the garden,
Otrada [13]
If the garden is square it would be 8 square feet.
6 0
2 years ago
2m+5=5(m-7)-3m equals??
Svetradugi [14.3K]
2m+5=5(m-7)-3m
first, use distributive property...
2m+5=5m-35-3m
next, combine like terms on the right side...
2m+5=2m-35
next, subtract 2m from both sides.
2m+5=2m-35
-2m   -2m
you will get....
5=-35 in which is not true. This means the equation has no solution.
6 0
2 years ago
Read 2 more answers
About 2,200 years ago, one of the most famous mathematicians in history made a major discovery. The mathematician was Archimedes
cupoosta [38]
I am looking for the same answer if anyone knows it
8 0
3 years ago
What is the answer to 3x - 17 = 7x - 9
Gnoma [55]
Take the numbers to one side

8 0
2 years ago
Someone please help me ✨
DedPeter [7]

Okay, so keeping mind that the equation for area is A = L x W, look at the measurements you already have. 5.5 x 10^5 is the length, and 4.2 x 10^4 is the width. Switch them into full form and use a calculator to multiply the two for the area in meters.

550000 x 42000 = 23100000000, which in scientific form is 2.31 × 10^10. So that's answer one.

For the second, in kilometers, just take the full measurement you already have, 23100000000 m, transfer it into kilometers, 23100000 km, and then find its scientific notation, 2.31 × 10^7. That's answer two.

To answer the last question for which is more suitable, just consider what number you'd prefer to look at: a bigger number or a smaller one. Since the kilometer measurement number is smaller, its correct.

Summarily, the answers are 2.31 × 10^10, 2.31 × 10^7, and square kilometers, in that order.

6 0
2 years ago
Other questions:
  • JIM TOSSES A BALL IN THE AIR WHEN ON THE COUNT OF 2, 3 , 5 8 13 what numbers will he count when he tosses the ball for the 6th 7
    9·1 answer
  • N-3-4n=21 <br> ( please solve)
    14·2 answers
  • The store has 28 notebooks in pack of 4. Three packs of notebooks are sold. How many packs of notebooks are left?
    12·2 answers
  • What is 0.00001 as a power of 10
    13·1 answer
  • Which expression is the exponential form of
    11·1 answer
  • Find the volume V of the described solid S. The base of S is an elliptical region with boundary curve 16x2 + 9y2 = 144. Cross-se
    11·1 answer
  • Someone pls help i don’t understand this
    11·1 answer
  • Janice can ride her bike 4 miles in 30
    5·1 answer
  • find the slope and y-intercept for a line passing through the following two points,then create a slope intercept equation (-2,2)
    9·1 answer
  • During the school year, teachers save money for use during the summer, when
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!