GradeGen

The value separating solutions from non-solutions; it is found by replacing the inequality sign with an equals sign.

First mark the boundary value, then show the correct side of it.

Check a boundary value to decide whether the circle should be open or closed; then test a value on the chosen side of the boundary.

The value separating solutions from non-solutions; it is found by replacing the inequality sign with an equals sign.

First mark the boundary value, then show the correct side of it.

Check a boundary value to decide whether the circle should be open or closed; then test a value on the chosen side of the boundary.

Boundary value