How do I graph a linear inequality with only one variable, like ?
Conditions
- The inequality restricts only one variable (y).
- The inequality is non-strict (≤).
Reasoning, step by step
- Identify the boundary line .
- Draw a solid horizontal line at to indicate that points on the line are included.
- Shade the region below the line to represent all y-values less than 2.
Example
The speaker explains, "because it's less than or equal to, it's a solid line as opposed to a dashed line," and "because it's less than, we need to shade below it rather than above it."
Common misconceptions
- Drawing a dashed line instead of a solid line.
- Shading above the line instead of below.
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Related questions
For an x-inequality, shade to the right if x is greater than the boundary value ( or ), and shade to the left if x is less than the boundary value ( or ).
Conditions: The inequality restricts x.; The boundary is a vertical line .
An inequality produces a vertical boundary when it restricts only the x-coordinate (e.g., ). It produces a horizontal boundary when it restricts only the y-coordinate (e.g., ).
Conditions: The inequality is in an xy-coordinate system.; The boundary is determined by replacing the inequality with equality.
The boundary line is solid because the inequality includes equality. Since x can be less than or equal to -2, the points on the line are part of the solution set.
Conditions: The inequality is non-strict (≤).; The boundary line is .
The region above is shaded because the inequality requires the y-coordinate to be greater than -4. On a standard coordinate plane, larger y-values are located above the horizontal line .
Conditions: The inequality restricts y.; The boundary is a horizontal line .
The boundary line is dashed because the inequality is strict. Since x is greater than 3 but not equal to 3, the points on the line are excluded from the solution set.
Conditions: The inequality is strict (>).; The boundary line is .
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