Derek has $20 to spend on used

books. Hardcover books cost

$5 each and paperbacks cost $2

each. What equation in standard

form determines the number x ot

hardcover books and the number y

of paperback books he can buy?

5x+2y = 20

For every hardcover book (x) you will be charged 5$.

For every paperback book (y) you will be charged 2$.

The amount of both types of books you buy has to be under or equal to 20$

The equation is 5x + 2y = 20

Step-by-step explanation:

Total money Derek having = 20 $

Cost of hardcover book = 5 $

Cost of paperbacks = 2 $

We need to find equation in standard form determines the number x of hardcover books and the number y of paperback books he can buy.

Total cost of x hard cover books = 5x

Total cost of y paperback books = 2y

He has only 20 $

So we have

5x + 2y = 20

The equation is 5x + 2y = 20