Algebra
posted by Sue on .
I have 18 bills that equal $100.00 (5$10 bills, 9$5 bills, 3$1 bills, 1$2 bill). How can this be expressed in an algebric equation?

Usually algebraic equations contain variables that represent some kind of unknown quantity.
In your case there is no unknown, you know all there is to know. There is no problem stated.