A university bookstore recently sold a wirebound graph paper notebook for $1.08, and a college ruled notebook for $3.12.At the start of the spring semester, a combination of 50 of these notebooks were sold for a total of $88.68 .How much of each type were sold?

Question

A university bookstore recently sold a wirebound graph paper notebook for $1.08, and a college ruled notebook for $3.12.At the start of the spring semester, a combination of 50 of these notebooks were sold for a total of $88.68 .How much of each type were sold?

Answer 1

Let x = wirebound and y = ruled.

x = 50-y

1.08x + 3.12y = 88.68

Substitute 50-y for x in second equation and solve for y. Insert that value into the first equation and solve for x. Check by inserting both values into the second equation.