1. **State the problem:** We need to graph the function $f$ over the interval $[-5,6]$.
Given:
- $f$ is piecewise linear (made of closed line segments joined end to end).
- $f(-5) = 1$.
- The derivative $f'$ is a step function defined as:
- $f'(x) = 0$ for $x \in [-5,-5)$ (not relevant since starting at -5), and $x \in [-7,-5)$
- $f'(x) = 1$ for $x \in [-5,-3)$
- $f'(x) = 0$ for $x \in [-3,-1)$
- $f'(x) = -1$ for $x \in [-1,2)$
- $f'(x) = 0$ for $x \in [2,7)$
2. **Formula and rules:** Since $f'$ is the derivative of $f$, the slope of $f$ on each interval equals the value of $f'$ on that interval.
3. **Calculate $f$ on each interval using the slope and initial point:**
- On $[-5,-3]$, slope $m=1$:
$$f(x) = f(-5) + 1 \cdot (x + 5) = 1 + (x + 5) = x + 6$$
At $x=-3$,
$$f(-3) = -3 + 6 = 3$$
- On $[-3,-1]$, slope $m=0$ (constant):
$$f(x) = f(-3) = 3$$
At $x=-1$,
$$f(-1) = 3$$
- On $[-1,2]$, slope $m=-1$:
$$f(x) = f(-1) - 1 \cdot (x + 1) = 3 - (x + 1) = 2 - x$$
At $x=2$,
$$f(2) = 2 - 2 = 0$$
- On $[2,6]$, slope $m=0$ (constant):
$$f(x) = f(2) = 0$$
4. **Summary of points and segments:**
- $(-5,1)$ to $(-3,3)$ with slope 1
- $(-3,3)$ to $(-1,3)$ with slope 0
- $(-1,3)$ to $(2,0)$ with slope -1
- $(2,0)$ to $(6,0)$ with slope 0
5. **Final piecewise function:**
$$
f(x) = \begin{cases}
x + 6 & -5 \leq x \leq -3 \\
3 & -3 < x \leq -1 \\
2 - x & -1 < x \leq 2 \\
0 & 2 < x \leq 6
\end{cases}
$$
This matches the graph with vertices at $(-5,1)$, $(-3,3)$, $(-1,3)$, $(2,0)$, and $(6,0)$ connected by line segments.
**Answer:** The graph of $f$ is piecewise linear with the above points and slopes.
Piecewise Linear E4A4Ee
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