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

apple computer's "smart team" is an example of a firm that succeeded by:

What did the Romans name the point of lights that the Greeks called planets?

Hooking a young person on a product during their adolescence is useless, seeing as they usually grow out of it by the time they reach college. True False

If supply for a product is high but demand is low, what most likely needs to happen to achieve equilibrium?

I want to do something

What is the reason for each step in the solution of the inequality? −2(x+3)−4>4x+30

What is 23.791 rounded to the nearest tenth?

in science, a hypothesis is useful only if

plural form of un escritorio

7. characteristics of peer pressure include of the following except: a) it is an influence that is always negative b) it is the influence of people your age c)