1. **State the problem:** We are given the equation $$j = 8d + 8$$ where $j$ is the amount of jam jarred and $d$ is the number of days spent making jam. 2. **Identify what is asked:** We need to find the amount of jam $j$ when Shelley spent $d = 1$ day making jam. 3. **Substitute the value:** Replace $d$ with 1 in the equation: $$j = 8(1) + 8$$ 4. **Calculate:** $$j = 8 + 8$$ $$j = 16$$ 5. **Interpret the result:** Shelley jarred 16 liters of jam after 1 day of making jam. **Final answer:** $$\boxed{16}$$ liters