# Question Video: Evaluating Variables by Direct Substitution in Given Linear Equations Representing Real-World Contexts

The equation π = 3β shows the number of cakes Matthew baked in relation to the number of hours he spent baking them. The variable β represents the number of hours spent baking the cakes, and the variable π represents the number of cakes baked. How many cakes did Matthew make if he spent 7 hours baking?