9. Hachi uses 2 tablespoons of peanut butter on each slice of toast she prepares. Let $$ s $$ represent the number of slices of toast, and let $$ t $$ represent the number of tablespoons of peanut butter she needs. Write an equation to represent this relationship, and use it to determine how many tablespoons of peanut butter she would need for 5 slices of toast.

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To model the relationship between the number of slices of toast ($$ s $$) and the number of tablespoons of peanut butter needed ($$ t $$), we can set up the following equation:

$$
t = 2s
$$

**Explanation:**
- Hachi uses **2 tablespoons** of peanut butter for **each slice** of toast.
- Therefore, the total tablespoons of peanut butter ($$ t $$) needed is **2 times** the number of slices ($$ s $$).

**Calculation for 5 slices of toast:**

$$
t = 2s = 2 \times 5 = 10
$$

**Conclusion:**
Hachi would need **10 tablespoons** of peanut butter to prepare **5 slices** of toast.
The equation is $$ t = 2s $$. For 5 slices of toast, Hachi needs 10 tablespoons of peanut butter.

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