Problema Solution
AT a bookstore, used hardcover books sell for $8 each and used softcover books sell for $2 each. You purchase 36 used books and spen $144. How many softcover books do you buy?
Answer provided by our tutors
let
x = the number of hardcover books
y = the number of softcover books
you purchase 36 used books and spend $144
x + y = 36
the cost of x used hardcover books + the cost of y used softcover books = the total cost
8x + 2y = 144 divide both sides by 2
4x + y = 72
by solving the system of equations
x + y = 36
4x + y = 72
click here to see step by step solution of the system of equations
we find
x = 12 hardcover books
y = 24 softcover books
I bought 24 softcover books.