To solve \( f(5) \) for the function \( f(x) = -x - 1 \), follow these steps:

1. **Substitute \( x = 5 \) into the function**:
   \[
   f(5) = -5 - 1
   \]

2. **Simplify the expression**:
   \[
   f(5) = -6
   \]

So, \( f(5) = -6 \).

If you need to find the value of \( 5f(5) \):

3. **Multiply \( f(5) \) by 5**:
   \[
   5f(5) = 5(-6) = -30
   \]

Therefore, \( 5f(5) = -30 \).

Would you like more details or have any questions? Here are some related questions you might find interesting:

1. How do you find the value of \( f(x) \) for different values of \( x \)?
2. What is the general approach to evaluating functions?
3. How would you solve \( f(x) = -x - 1 \) for other values like \( x = -2 \)?
4. What is the domain and range of the function \( f(x) = -x - 1 \)?
5. How do you graph the function \( f(x) = -x - 1 \)?
6. What are the properties of linear functions like \( f(x) = -x - 1 \)?
7. How do you find the inverse of the function \( f(x) = -x - 1 \)?
8. What is the effect of multiplying a function by a constant, like \( 5f(x) \)?

**Tip:** When dealing with linear functions, remember that the slope indicates how steep the line is, and the y-intercept is where the line crosses the y-axis.

Learn how to evaluate the function f(x) = -x - 1 at x = 5 and compute 5 times f(5) with detailed steps and explanations. This problem involves linear equations and function evaluation, suitable for Grades 7-9 students.

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