Question

Part A

Answer 1

Answer:

Options A , B and D are fulfilling the requirements.

Step-by-step explanation:

Derek has $80 to spend on used books. Hardcover books cost $10 each, and paperbacks cost $20 each.

Let x be the number of hardcover books and y be the number of paperback books Derek can buy.

The total books he can buy are $10x+20y \leq80$

A.  (0, 4) substituting x as 0 and y as 4

$0(10)+4(20)$

= 80

B.  (2, 3) substituting x as 2 and y as 3

$2(10)+3(20)$

= $20+60$

= 80

C.  (7, 2)  substituting x as 7 and y as 2

$7(10)+2(20)$

= $70+40$

= 110

D.  (8, 0)  substituting x as 8 and y as 0

$8(10)+0(20)$

= 80

Hence, options A , B and D are fulfilling the requirements.

Answer 2

The answer is A, B, and D.