#17 if anyone can . much appreciated.

We set up a system of equations to solve.

Let x = number books priced at $6.99 and y = number books  priced $9.99.

There are 32 books bought so we have the equation:-

x + y = 32(1)

Now we get an equation from the costs of the books

6.99x + 9.99y = 256.68(2)

Solving this system of 2 equations:-

From equation (1):-   y = 32 - x

Now substitute this into equation (2):-

6.99x + 9.99(32 - x) =  256.68

6.99x + 319.68 - 9.99x = 256.68

-3x =  - 63

x = 21

From equation (1) y = 32 - 21 = 11

So Amber bought 21 books at 6.99 and 11 books at 9.99 dollars   Answer

x = 12

y = 15

step-by-step explanation: