You can represent the rule as an expression using multiplication. Since the supermarket donates 35 cans of food each week, the relationship between the number of weeks \( w \) and the total number of cans donated \( n \) can be expressed as:
\[ n = 35w \]
In this expression:
- \( n \) represents the total number of cans of food donated.
- \( w \) represents the number of weeks.
- The number 35 is the constant rate of cans donated per week.
So, for any given number of weeks \( w \), you can plug that value into the expression \( n = 35w \) to find the total number of cans donated after those weeks have passed.