The complex number given is $-i - 3$, which can be rewritten as $-3 - i$. To plot this on the complex plane:

1. The real part of the complex number is $-3$, which corresponds to the horizontal axis (Real axis).
2. The imaginary part is $-1$, which corresponds to the vertical axis (Imaginary axis).

To plot $-3 - i$:

• Start at the origin $(0, 0)$.
• Move 3 units to the left (because the real part is $-3$).
• Move 1 unit down (because the imaginary part is $-1$).

So, the point to plot is at $(-3, -1)$ on the complex plane.

Would you like any further details or explanations? Here are some related questions for further exploration:

1. What is the geometric interpretation of the magnitude of a complex number?
2. How do you determine the angle (argument) of a complex number on the complex plane?
3. How would you plot the complex conjugate of $-3 - i$?
4. What does it mean to add two complex numbers graphically?
5. How can you multiply two complex numbers geometrically?

Tip: The horizontal axis represents the real part, and the vertical axis represents the imaginary part when plotting complex numbers.