Q. Which is the graph of the linear inequality \(y \ge -x – 3\)?
Answer
Boundary: (y = -x – 3) (solid line because the inequality is \ge).
Intercepts: passes through (0, -3) and (-3, 0).
Shade: the region above or on the line (contains the origin, since 0 \ge -3 is true).
Final: solid line through (0, -3) and (-3, 0) with the half-plane above it shaded.
Detailed Explanation
Problem: Graph the linear inequality \( y \ge -x – 3 \)
Step 1 – Identify the boundary line
The boundary line is the equation
\[
y = -x – 3
\]
Because the inequality is \(\ge\), draw this boundary as a solid line (points on the line are included in the solution set).
Step 2 – Find the intercepts of the boundary line
To find the y-intercept, set \( x = 0 \):
\[
y = -(0) – 3 = -3
\]
So the y-intercept is \((0,-3)\).
To find the x-intercept, set \( y = 0 \):
\[
0 = -x – 3
\]
\[
x = -3
\]
So the x-intercept is \((-3,0)\).
Step 3 – Determine the shading region using a test point
Pick a test point not on the line, for example \((0,0)\). Substitute it into the inequality:
\[
0 \ge -(0) – 3
\]
\[
0 \ge -3
\]
This is true, so the half-plane containing the origin should be shaded.
Step 4 – Describe the final graph
Draw the solid line \( y = -x – 3 \) through the points \((0,-3)\) and \((-3,0)\). Shade the region above the line (the half-plane containing the origin) to represent all solutions of the inequality.
Answer
\[
y \ge -x – 3
\]
The graph is the solid line \( y = -x – 3 \) with the region above the line shaded.
Graph
FAQs
What is the boundary line for (y ge -x - 3)?
Do I draw the boundary as solid or dashed?
Which side of the line should I shade?
How do I find the x-intercept?
How can I graph the line using rise and run?
How to test whether a point ((a,b)) satisfies the inequality?
What is the inequality in standard form?
Is the solution region convex?
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