The core underlying concepts in algebra are variables, expressions, equations and inequalities. You will see them throughout your math life (and even life after school). This tutorial won't give you all the tools that you'll later learn to analyze and interpret these ideas, but it'll get you started thinking about them. Common Core Standards: 6.EE.B.5, 6.EE.B.6, 6.EE.B.7
In this word problem we're looking to see if various possible answers can be substituted for variables in the expressions, and if the resulting equality holds up. That may actually sound harder than it is, so just jump in with us!