What is the formula to determine how many pounds of tomatoes are left after using 35 pounds?

The formula to determine how many pounds of tomatoes remain after using 35 pounds is represented by the expression y - 35. In this context, "y" represents the initial amount of tomatoes. To find the leftover quantity after using 35 pounds, you subtract the amount used (35 pounds) from the initial amount (y).

This approach effectively captures the essence of a simple mathematical operation where you take the total quantity (y) and decrease it by the amount utilized (35), resulting in the remaining quantity. Thus, the expression provides the correct amount of tomatoes left after usage.