Question

A library is having a used book sale. All hardcover books

Answer 1

You have 4 hardcovers and 2 soft covers... soo the equation would be 4x+2y=$24
for the friend the equation would be 3x+3y=$21

Answer 2

Answer:  It should cost $5

Step-by-step explanation:

First you have 4 hardcover and 2 softcover, so 4x+2y= $24 and for your friend it would be 3x+3y= $21.

You have

(3x+3y)2  = 72

(4x+2y)3  = 42

Then subtract them which is 30 you would divide by 6 since 3x2=6

Which gets you to 5.