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At a bookstore used hardcover books sell for $8 each and used softcover books sell for $2 each. You purchase 36 used books and spend $144. How many softcover books do you buy?

Respuesta :

rspill6

Answer:

Step-by-step explanation:

Let H be the number of harcover, and S the number of softcover books.

We know that:

H+S=36

and $8*(H) + $2*(S) = $144

Rearrange the first: H = 36 - S

Use this definition of H in the second equestion:

$8*(H) + $2*(S) = $144

$8*(36-S) + $2*(S) = $144

$288 - 8S + 2S = $144

-6S = -144

S = 24

This means H = 36 - S is:

H = 36 - 24

H = 12

"You" purchased 24 softcover and 12 hardcover books.

Check the results: 24*2 + 12*8 = 48 + 96 = $144 It

works.