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

If Chandani had 600 left after spending 75% of her money, how much did she have in the beginning? 5% this year

carbon 10 has a half-life of 19.29s. if you have 1.53 kg, how long will it take until you have less than 10.0 g.

The final velocity, v, of an object is related to its initial velocity, u, its acceleration, a, and its displacement, s by the following formula: v² = u² + 2as

if I had enough money I would fly (begin with had)

Hi, How are you and your baby? I have something to ask regarding my studies. You know I'm using your old desktop at home to work on my university assignments, b

23 X 4 1/6+37 x 4 1/6

Find the value of x. 6 X X + 1 9

What is 840 divided by 11???

PLEASE HELP Will the answer be A) or D) there is confusion. I think it is D but it might be A because the figure has 1 hexagon, 2 pentagons, 2 squares and in th

A pencil is 712 inches long. How long is the pencil in centimeters?