1. **State the problem:** We need to graph the piecewise function
$$f(x) = \begin{cases} 1 - 2x & \text{if } x < 1 \\ x - 3 & \text{if } x \geq 1 \end{cases}$$
and determine which graph (A, B, C, or D) correctly represents it.
2. **Analyze each piece:**
- For $x < 1$, the function is $f(x) = 1 - 2x$. This is a line with slope $-2$ and y-intercept $1$. It is decreasing because the slope is negative.
- For $x \geq 1$, the function is $f(x) = x - 3$. This is a line with slope $1$ and y-intercept $-3$. It is increasing because the slope is positive.
3. **Evaluate the function at the breakpoint $x=1$:**
- Left piece limit as $x \to 1^-$:
$$f(1^-) = 1 - 2(1) = 1 - 2 = -1$$
- Right piece value at $x=1$:
$$f(1) = 1 - 3 = -2$$
4. **Interpret the values at $x=1$:**
- Since the function is defined as $1 - 2x$ for $x < 1$, the point at $x=1$ for this piece is an open circle at $(1, -1)$.
- Since the function is defined as $x - 3$ for $x \geq 1$, the point at $x=1$ for this piece is a closed circle at $(1, -2)$.
5. **Summary of graph shape:**
- Left segment: decreasing line approaching $(1, -1)$ with an open circle.
- Right segment: increasing line starting at $(1, -2)$ with a closed circle.
6. **Choose the correct graph:**
- Graph B matches this description exactly.
**Final answer:** The correct graph is **B**.
Piecewise Graph 603B9A
Step-by-step solutions with LaTeX - clean, fast, and student-friendly.