Piecewise Graph 4B5Bb7
1. Problem: Given the piecewise function
$$f(x) = \begin{cases} 3 - x & x \leq 1 \\ 2x & x > 1 \end{cases}$$
We need to identify which graph corresponds to this function.
2. Analyze each piece:
- For $x \leq 1$, $f(x) = 3 - x$ is a line with slope $-1$ and y-intercept $3$.
- For $x > 1$, $f(x) = 2x$ is a line with slope $2$ and y-intercept $0$.
3. Evaluate the function at $x=1$ to check continuity:
- From left: $f(1) = 3 - 1 = 2$
- From right: $f(1) = 2 \times 1 = 2$
The function is continuous at $x=1$ with value $2$.
4. Plot key points:
- For $x \leq 1$, points include $(0,3)$ and $(1,2)$ on the line $3 - x$.
- For $x > 1$, points include $(1,2)$ and $(2,4)$ on the line $2x$.
5. Graph shape:
- Left segment: line decreasing from $(0,3)$ to $(1,2)$.
- Right segment: line increasing from $(1,2)$ upwards.
6. Match with options:
- Option A: Line from $(0,2)$ sloping downward to $(1,2)$, then sharp upward slope starting at $x=1$.
- Our function's left segment starts at $(0,3)$, not $(0,2)$, but the shape matches a downward slope to $(1,2)$ and then upward slope.
- Other options do not match the slopes and continuity.
Final answer: The graph corresponds to option A.