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.

See full solution

Graph

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FAQs

What is the boundary line for (y ge -x - 3)?

A: The boundary is the line (y = -x - 3). Graph it using slope-intercept form: slope (m=-1), y-intercept ((0,-3)).

Do I draw the boundary as solid or dashed?

A: Draw a solid line because the inequality uses (ge), so points on the line satisfy the inequality.

Which side of the line should I shade?

A: Shade the half-plane where (y) is greater than or equal to (-x-3). Test ((0,0)): (0 ge -3) is true, so shade the region containing the origin (on or above the line).

How do I find the x-intercept?

A: Set (y=0) in (y = -x - 3): (0 = -x - 3) gives (x = -3). The x-intercept is ((-3,0)).

How can I graph the line using rise and run?

A: Start at ((0,-3)). Slope (-1) means rise (-1) for run (1): from ((0,-3)) go right 1 and down 1 to ((1,-4)), or left 1 and up 1 to ((-1,-2)).

How to test whether a point ((a,b)) satisfies the inequality?

A: Substitute into (y ge -x - 3): check if (b ge -Q: - 3). If true, the point is in the shaded region or on the boundary.

What is the inequality in standard form?

A: Rearranged, (y ge -x - 3) becomes (x + y ge -3) or (x + y + 3 ge 0).

Is the solution region convex?

A: Yes. The solution set is a half-plane (the line plus one side), which is a convex set.
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