1. **State the problem:** Simplify the expression $$-3y + -y - 7y + -8y + 3y$$. 2. **Combine like terms:** All terms are multiples of $y$, so we add their coefficients. 3. Write the sum of coefficients: $$-3 + (-1) - 7 + (-8) + 3$$ 4. Simplify step-by-step: $$-3 - 1 - 7 - 8 + 3$$ $$= (-3 - 1) - 7 - 8 + 3$$ $$= -4 - 7 - 8 + 3$$ $$= (-4 - 7) - 8 + 3$$ $$= -11 - 8 + 3$$ $$= (-11 - 8) + 3$$ $$= -19 + 3$$ $$= -16$$ 5. **Final simplified expression:** $$-16y$$ This means all the terms combined give $$-16y$$ as the simplified form.