Question: Lucas is making salsa. He wants to know the cost of 2 bags of tortilla chips and 3 pounds of tomatoes. Let $b$ equal the price per bag of tortilla chips. Write an expression for the total cost of the tortilla chips.

1. **State the problem:** Lucas wants to find the total cost of 2 bags of tortilla chips. 2. **Define variables:** Let $b$ be the price per bag of tortilla chips. 3. **Write the expression:** Since each bag costs $b$, the cost for 2 bags is $$2 \times b = 2b$$. 4. **Final expression:** The total cost of the tortilla chips is $2b$. Note: The problem also mentions 3 pounds of tomatoes, but since no price variable is given for tomatoes, we only write the expression for tortilla chips as requested.