To determine the y-coordinate of the y-intercept of the function $f(x) = -(x - 5)$, we evaluate $f(x)$ at $x = 0$, since the y-intercept occurs where $x = 0$.

Step-by-Step Solution:

1. The function is given as: $f(x) = -(x - 5)$
2. Substituting $x = 0$: $f(0) = -(0 - 5)$
3. Simplify the expression: $f(0) = -(-5)$
4. Therefore: $f(0) = 5$

Final Answer:

The y-coordinate of the y-intercept is 5.

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Would you like further clarification or additional examples? Here are some related questions to explore:

1. What is the x-coordinate of the x-intercept of this function?
2. How do you find intercepts for quadratic functions?
3. How does the slope of a linear function like this affect its graph?
4. Can you rewrite this function in slope-intercept form?
5. How would this function change if the negative sign were removed?

Tip: Always evaluate the y-intercept by substituting $x = 0$ into the function!