Question: Select the equations that are written in function notation.
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y = 6x - 7
y = -9x - 1
-9x
f(x) = -x + 8
y = -9x - 9
f(x) = -4x - 7
1. **State the problem:** Identify which equations are written in function notation.
2. **Recall the definition:** Function notation is written as $$f(x) = \text{expression}$$ where $$f$$ is the function name and $$x$$ is the input variable.
3. **Analyze each equation:**
- $$y = 6x - 7$$: This is an equation for $$y$$, not in function notation.
- $$y = -9x - 1$$: Same as above, not function notation.
- $$-9x$$: This is just an expression, not an equation or function notation.
- $$f(x) = -x + 8$$: This is in function notation because it uses $$f(x)$$.
- $$y = -9x - 9$$: Again, not function notation.
- $$f(x) = -4x - 7$$: This is in function notation.
4. **Conclusion:** The equations written in function notation are:
$$f(x) = -x + 8$$ and $$f(x) = -4x - 7$$.
**Final answer:**
The function notation equations are $$f(x) = -x + 8$$ and $$f(x) = -4x - 7$$.