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 objective of looking epidermal cell of onion?

Substance A with a specific heat of 1.25 J/g∙oC and Substance B with a specific heat of 12.5 J/g∙oC. If both were exposed to the same amount of heat which one w

How do you think Revere intended his viewers to understand the event?

please help. 7. 2 × 5. 28

Which of the following are exterior angles? Check all that apply. A. <3 B.<2 C. <6 D.< 4 E<5 F.<1

All of the following is leading to less habitable land for human populations except - catastrophic floods - fewer wildfires - increased drought - rising sea

I need help with this I will give 100 points

solve the following proportion 16/18 = 4/c

Divide. 52.98 ÷ 10³ Enter your answer as a decimal in the box. help!!!!!!!!

How many whole numbers between 1 and 400 contain the digit 2?.