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An inequality produces a vertical boundary when it restricts only the x-coordinate (e.g., $x = c$). It produces a horizontal boundary when it restricts only the y-coordinate (e.g., $y = c$).

Conditions: The inequality is in an xy-coordinate system.; The boundary is determined by replacing the inequality with equality.

An inequality produces a vertical boundary when it restricts only the x-coordinate (e.g., $x = c$). It produces a horizontal boundary when it restricts only the y-coordinate (e.g., $y = c$).

Conditions: The inequality is in an xy-coordinate system.; The boundary is determined by replacing the inequality with equality.