Question: Homework 6.6: Linear Inequalities in Two Variables
Graph: y < 1/4 x + 1
Graph shape: coordinate grid with x- and y-axes from -5 to 5, and the inequality boundary should be a dashed line with slope 1/4 and y-intercept 1, with the region shaded below the line.
1. **State the problem:** We need to graph the linear inequality $$y < \frac{1}{4}x + 1$$ on a coordinate grid with x- and y-axes ranging from -5 to 5.
2. **Understand the inequality:** The inequality $$y < \frac{1}{4}x + 1$$ means we want to shade the region below the line $$y = \frac{1}{4}x + 1$$.
3. **Graph the boundary line:**
- The boundary line is $$y = \frac{1}{4}x + 1$$.
- It has slope $$m = \frac{1}{4}$$ and y-intercept $$b = 1$$.
- Plot the y-intercept at point $$(0,1)$$.
- From $$(0,1)$$, use the slope to find another point: rise 1 unit up for every 4 units right, so from $$(0,1)$$ go right 4 units to $$(4,2)$$.
4. **Draw the boundary line as dashed:** Since the inequality is strict ($$<$), the boundary line should be dashed to indicate points on the line are not included.
5. **Shade the region below the line:** Because the inequality is $$y < \frac{1}{4}x + 1$$, shade the area below the dashed line.
6. **Check a test point:** Use $$(0,0)$$ to verify shading.
- Substitute into inequality: $$0 < \frac{1}{4}(0) + 1 \Rightarrow 0 < 1$$ which is true.
- So, shade the region containing $$(0,0)$$, which is below the line.
**Final answer:** The graph shows a dashed line with slope $$\frac{1}{4}$$ and y-intercept $$1$$, with the region below the line shaded.