Use the variable from part (a) to write an algebraic expression that represents the other quantity in this situation.

In many algebra problems, a crucial step is defining your variables clearly. For instance, if you let \( x \) equal the number of pencils, you could express the total cost using the expression \( 2x \) if each pencil costs $2. Now, if you need to consider another aspect, like the total number of items including erasers, you might create an expression like \( x + y \) where \( y \) represents the number of erasers plus your pencils, broadening your understanding of the total quantity! To enhance your grasp of the situation, think about substituting different values for the variables. This not only strengthens your problem-solving skills but also exposes common pitfalls like forgetting to distribute or collecting like terms incorrectly. Remember, practice makes perfect, so keep experimenting with various expressions!