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What is the process for graphing a linear inequality with two variables, such as y>x−2y > x - 2?

To graph y>x−2y > x - 2, first identify the slope (m=1m = 1) and y-intercept (b=−2b = -2) from the slope-intercept form. Plot the y-intercept and use the slope to plot additional points. Draw a dashed boundary line through the points because the inequality is strict. Finally, shade the region above the line because y is greater than the expression.

Conditions

  • The inequality is in two variables (x and y).
  • The inequality is strict (>).

Reasoning, step by step

  1. Identify the slope and y-intercept from the equation y=x−2y = x - 2.
  2. Plot the y-intercept at (0, -2).
  3. Use the slope (rise over run = 1/11/1) to plot additional points.
  4. Draw a dashed line through the points to indicate the boundary is not included.
  5. Shade the region above the line to represent y>x−2y > x - 2.

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.

Watch the explanation

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