Hey Crystuls.

An inequality is in the form of >=, <=, >, or < where they mean greater than or equal, less than or equal, greater than or less than.

Basically as an example lets say x is number of fish, y is number of scoops of chips, and they can only spend twenty dollars maximum then we have

x*2.50 + y*2.00 <= 20.00.

This is an example of an inequality for your situation (math problem).