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

What is greater 4/25 or 0.28?

Which perspective argues that technology plays a defining role in shaping society?

One major difference between modeling economic busts and booms is that ____________.

During the Napoleonic Wars, Britain and France each tried to A. make peace. B. work with American Indians. C. get US support. D. avoid further wars.

Fruit basket is made with apple and oranges.the ratio of apples to oranges in a fruit basket is 2 to 3.if there are 45 pieces of fruit in the basket, then how m

what is the answer to #14 and how did you do itthank you

True or False: tone and voice as literary devices are the same thing.

ryan can create 2/7 wedding cakes per hour . At this rate, how many cakes is he going to make in 49 hours?

how do I find the slope of a line with multiple points on a graph

"ibm, memorial sloan kettering, and cedars-sinai have" a _________ whereby ibm receives expert medical knowledge that it uses to leverage its technological skil