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On a graph, what does y ≥ 0 represent?

Answer and explanation

Correct answer: The upper half-plane including the horizontal axis

In the Cartesian plane, y is the vertical coordinate, measured from the horizontal x-axis. The inequality y ≥ 0 means that the y-coordinate may be positive or exactly zero. Consequently, every point above the x-axis is included, and every point on the x-axis is also included because it has y = 0. The boundary is therefore included, so the region is the upper half-plane together with the horizontal axis. It is not only the origin, because infinitely many points satisfy the condition. The lower half-plane has y < 0, while left and right regions are described by conditions on x. Thus option A is correct.

Related tags

Linear InequalitiesHalf-PlaneCoordinate GeometryGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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