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

how does the biosphere rely on the other spheres for survival

Who were the emigre? a. Nobles who fled France c. The soldiers of the National Guard b. Peasants who migrated outside of France looking for work d. 29 sympa

When a group of cells that all have the same basic structure and function come together, they form a(n) _____.

angles help find values

uzupełnij schemat odpowiednimi

During an ice age, land can move and specific areas can be permanently changed. a. True b. False

What is the area of the polygon?

Mark each statement if it describes a key characteristic of Athenian democracy. A. Ten elected generals were responsible for carrying on the work of the Assem

how can you define a mixed number and the first one two answer gets 24 pts

Ethically, is brain death not as final as cardiac death? why or why not