Evaluating expressions with two variables

The first instance of the Evaluating expressions in 2 variables exercise falls under the Algebra I Math Mission.

Types of problems
1. Evaluate the following expression when x = a number; y = a number. This problem gives you an expression with two unknowns along with a number. The student is required to substitute the value of those two unknowns into the expression and evaluate it.

Strategies
It is hard to get the speed badges in this skill. Substituting the numbers to the unknowns and evaluating the entire expression may take 15-20 seconds.