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What is the area of the triangle formed by x≥0, y≥0, and 2x+3y≤18?

Answer and explanation

Correct answer: 27 square units

The governing concept is using the axis intercepts of a linear boundary to find the area of the feasible triangle. The boundary is 2x+3y=18. Setting y=0 gives 2x=18, so x=9 and the x-intercept is (9,0). Setting x=0 gives 3y=18, so y=6 and the y-intercept is (0,6). Together with the origin, the first-quadrant region is a right triangle with perpendicular legs 9 and 6. Its area is 1/2×base×height=1/2×9×6=27 square units. Therefore option A is correct. The values 18 and 36 result from missing or doubling the one-half factor, while 54 does not follow from the intercepts. The non-strict inequalities include the boundary but do not change the area.

Related tags

Linear InequalitiesAreaTriangular RegionClass 11Graphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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