https://file.aiquickdraw.com/mathbot/file/1725978726884vbxhui4y.jpg

The expression given is:

\[
f(x) = 5x - 9; \, x = 4
\]

To find \( f(4) \), we substitute \( x = 4 \) into the equation.

\[
f(4) = 5(4) - 9
\]
\[
f(4) = 20 - 9
\]
\[
f(4) = 11
\]

Thus, \( f(4) = 11 \).

Would you like any additional details, or do you have any questions about this solution?

Here are 5 related questions for further exploration:
1. What is the slope of the function \( f(x) = 5x - 9 \)?
2. How would the value of \( f(x) \) change if \( x = 6 \)?
3. What does the graph of \( f(x) = 5x - 9 \) look like?
4. Can you find the x-intercept of the function \( f(x) = 5x - 9 \)?
5. What would be the inverse of the function \( f(x) = 5x - 9 \)?

**Tip:** For any linear function in the form \( f(x) = ax + b \), the slope is \( a \), and the y-intercept is \( b \).

Learn how to evaluate the linear function f(x) = 5x - 9 by substituting x = 4. This problem involves basic algebraic concepts, suitable for students in Grades 6-8.

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