The slope would be -1 or -1/1. They are both the same thing.
The slope is the number which is located directly to the left of the variable (the variable in this case is x, but in other situations it could be a totally different letter).
Kelsey must spend less than or equal to $65. The expression 5.50b+7.5 is correct Kelsey able to purchase 10 books. On the end Kelsey can spend $2.50 to purchase small present (calendar or book for notes)
