Final answer:
When evaluating a limit using direct substitution, you substitute the value the variable approaches directly into the function.
Step-by-step explanation:
When evaluating a limit using direct substitution, you substitute the value the variable approaches directly into the function. Let's say we have a function f(x) and we want to find the limit as x approaches a. We substitute a into f(x) and simplify. If the expression is defined at a, then the limit is equal to that value. If it is undefined, we can try other methods like factoring or simplifying to apply direct substitution.