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

19) The function C(x) = 25x+75 represents the labor cost (in dollars) for Bob's Auto Repair to replace your alternator, where x is the number of hours. The tabl

One ticket cost $6, and two tickets for a couple cost $10. You sold 196 tickets and gained $1076. How many couples bought tickets?

Find the next three numbers in the pattern. Write your answer as decimals 4.1, 4.5, 4.9, 5.3,

A manicurist wants to earn a gratuity of $150 use a proportion

A dispute over what island group resulted in a 1988 naval battle between china and vietnam, leaving 75 vietnamese sailors dead?

If the P generation are constricted with genotype ss and smooth with genotype SS what texture will the genotype Ss be in the F1 generation?

Please help! Graph y= -3/2 x -3.

Cuál es la relación de el ángulo convexo y el ángulo obtuso?

Use a trigonometric ratio to solve for c. Round to two decimal places as necessary!! HELP, and can someone explain how to get the answer?

Brahms’s musical trademarks included A. bombastic flamboyance B. the use of two notes against three C. the use of da capo arias D. all of the above