sleepingknights789 sleepingknights789

02-04-2021
Mathematics

contestada

David bought 3 DVDs for 4 books for $40 at a yard sale. Anna bought 1 DVD and 6 books for $18. How much did each DVD and book cost?

Respuesta :

clarch19 clarch19

02-04-2021

Answer:

dvd cost $12 each

book cost $1 each

Step-by-step explanation:

3d + 4b = 40

d + 6b = 18

substitution method:

d = 18-6b

3(18-6b) + 4b = 40

54 - 18b + 4b = 40

-14b = -14

b = $1

d + 6 = 18

d = $12

Answer Link

Otras preguntas

On a map of the city .1 centimeter represents 2.5 miles . what distance on the map would represents 20 miles?

after inputting a formula or a piece of data into a cell, what happens to the cell pointer when you press enter?

When vibrational motion in an object increases, which is a true statement? A. Kinetic energy, temperature, and thermal energy increase. B. Kinetic energy, temp

I'm having a hard time with fractions, what is the sum of 2/5 and 2/4

one craft stick is 5 centimeters long and the other is 8 centimeters long. which of the following cannot be the length of the craft stick that she will use for

true of false - Whom is used correctly in this sentence Whom should I vote for?

To paint a house, two painters are hired. The first painter can paint the entire house in ten hours. The second painter will need six hours to paint the entire

who was martin luther and what idea of his became the cheif teaching of the protestant reformation

Which word has a root meaning associated with a fur-bearing animal? A.apiary B.aviary C.ursine D.piscine

If f(x) = 2x and g(x)=1/x, what is the domain of (f o g)(x)? x_>0 all real numbers except x = 0 x<_0 all real numbers