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If the solution region is formed by x ≥ 1, y ≥ 2, and x + y ≤ 7, what is its area?

Answer and explanation

Correct answer: 8 square units

The inequality x ≥ 1 keeps the region to the right of the vertical line x = 1, while y ≥ 2 keeps it above the horizontal line y = 2. The condition x + y ≤ 7 keeps it below the line x + y = 7. The boundary intersections are (1, 2), (5, 2), and (1, 6): substituting y = 2 gives x = 5, and substituting x = 1 gives y = 6. These points form a right triangle. Its horizontal base is 5 − 1 = 4 units and its vertical height is 6 − 2 = 4 units. Therefore area = 1/2 × 4 × 4 = 8 square units. Hence option B is correct; the other choices do not equal the triangle’s area.

Related tags

Linear InequalitiesFeasible RegionTriangle AreaGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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