The table below shows the relationship between feet and yards fill in each box to write an algebraic expression to a represent the number of feet and any number of yards

We are asked to write an algebraic equation to represent the number of feet in any number of yards:

Words:  

Clearly from the entries in the table we could say that:

The number of feet is three(3) times the number of yards.

Variable:  

Let f denotes the number of feet.

and y denotes the number of yards.

Model:

So, finally we could write our algebraic equation in terms of variables as: