To write an equation to represent the total spent for any given number of art classes, you start with the fixed cost for materials and then add the variable cost for each class.
Let:
- \( y \) be the total cost
- \( x \) be the number of classes
The cost for materials is a one-time fee of $45, and the cost per class is $10. Therefore, the total cost equation can be expressed as:
\[ y = 10x + 45 \]
The correct response is:
y = 10x + 45