9. Use the discriminate to determine the number of solutions to the quadratic equation $y=3 x-4

Step 1 ：The given equation is not a quadratic equation. A quadratic equation is of the form $ax^2 + bx + c = 0$. The given equation is a linear equation. Therefore, the concept of discriminant does not apply here. However, a linear equation always has one solution.

Step 2 ：Final Answer: The given equation has \(\boxed{1}\) solution.