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Which half-plane is selected by 5x − 2y < 10?

Answer and explanation

Correct answer: y > (5x − 10)/2

The governing idea is that a linear inequality in two variables describes a half-plane whose boundary is obtained by replacing the inequality sign with equality. Starting with 5x − 2y < 10, subtract 5x from both sides to get −2y < 10 − 5x. Dividing by −2 reverses the inequality sign, so y > (10 − 5x)/(−2) = (5x − 10)/2. Therefore option A is correct. The boundary line is y = (5x − 10)/2, and because the original sign is strict, the boundary is not included and would be drawn dashed. Option B forgets to reverse the sign; C has the wrong direction and expression; D changes the constant incorrectly.

Related tags

Linear InequalitiesGraphical SolutionHalf-PlaneClass 11Graphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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