The function you provided is:

\[
f(-3) = 6 - 7x
\]

This means that when the input is \( x = -3 \), the output of the function is:

\[
f(-3) = 6 - 7(-3)
\]

Now, I'll calculate this expression.

\[
f(-3) = 6 + 21 = 27
\]

Thus, the output is \( f(-3) = 27 \).

Would you like more details or have any questions? 

Here are five related questions to expand your understanding:
1. What is \( f(x) \) if \( f(x) = 6 - 7x \)?
2. How do you find the value of a function for a given input?
3. Can you graph the function \( f(x) = 6 - 7x \)?
4. How do you solve \( f(x) = 0 \) for \( f(x) = 6 - 7x \)?
5. What is the slope of the line represented by \( f(x) = 6 - 7x \)?

**Tip**: When plugging negative numbers into functions, remember to pay attention to the signs when multiplying!

Learn how to evaluate the function f(-3) when f(x) = 6 - 7x using substitution. This solution walks through key algebraic concepts, including function evaluation and linear equations. Perfect for students in Grades 7-9.

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