What is the process for graphing a linear inequality with two variables, such as ?
Conditions
- The inequality is in two variables (x and y).
- The inequality is strict (>).
Reasoning, step by step
- Identify the slope and y-intercept from the equation .
- Plot the y-intercept at (0, -2).
- Use the slope (rise over run = ) to plot additional points.
- Draw a dashed line through the points to indicate the boundary is not included.
- Shade the region above the line to represent .
Example
The speaker explains, "The number in front of x is the slope... and the constant you see on the outside that's the y intercept which is negative two," and later, "Now, it's greater than but not equal to, so we're going to draw a dashed line through these points."
Common misconceptions
- Drawing a solid line instead of a dashed line.
- Shading below the line instead of above.
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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 .
To graph , first draw a horizontal boundary line at . Make the line solid because the inequality includes equality.
Conditions: The inequality restricts only one variable (y).; The inequality is non-strict (≤).
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 .
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