Brewer Harrington
05/17/2024 · Elementary School
Graph the inequality \(3x - y \leq 9\) on a coordinate plane.
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Step-by-step Solution
To graph the inequality \(3x - y \leq 9\), we can follow these steps:
1. **Rewrite the inequality**: First, we can rewrite the inequality in slope-intercept form (i.e., \(y = mx + b\)):
\[
-y \leq -3x + 9
\]
Multiplying through by -1 (and flipping the inequality sign) gives:
\[
y \geq 3x - 9
\]
2. **Graph the boundary line**: The boundary line is given by the equation \(y = 3x - 9\). To graph this line, we can find two points:
- When \(x = 0\):
\[
y = 3(0) - 9 = -9 \quad \text{(Point: (0, -9))}
\]
- When \(x = 3\):
\[
y = 3(3) - 9 = 0 \quad \text{(Point: (3, 0))}
\]
Now, plot the points \((0, -9)\) and \((3, 0)\) on the coordinate plane.
3. **Draw the line**: Since the inequality is \(\leq\), we will draw a solid line through these points to indicate that points on the line are included in the solution set.
4. **Shade the appropriate region**: The inequality \(y \geq 3x - 9\) indicates that we want to shade the region above the line. This includes all points where the \(y\)-value is greater than or equal to the \(y\)-value on the line.
5. **Final graph**: The final graph will show a solid line representing \(y = 3x - 9\) and the region above this line shaded.
Here’s a summary of the graphing steps:
- Draw a solid line for \(y = 3x - 9\).
- Shade the area above the line to represent the solution set for the inequality \(3x - y \leq 9\).
This is how you would graph the inequality on a coordinate plane.
Quick Answer
Graph the line \(y = 3x - 9\) as a solid line. Shade the region above the line to represent the solution set for \(3x - y \leq 9\).
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