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In the first quadrant, what shape is formed by x + y ≤ 8, x ≥ 0, y ≥ 0?

Answer and explanation

Correct answer: Triangle

The governing idea is graphical solution of simultaneous linear inequalities. The conditions x ≥ 0 and y ≥ 0 restrict the solution to the first quadrant, including both coordinate axes. The boundary x + y = 8 has intercepts (8, 0) and (0, 8). Because the sign is ≤, the region on the side containing the origin is selected, and the boundary line is included. Consequently, the feasible region has vertices (0, 0), (8, 0), and (0, 8), forming a closed triangle. It is bounded, so it cannot be an unbounded strip. Although the axes meet at right angles, the figure has only three sides and is not a square or rectangle. Therefore option A is correct.

Related tags

Linear InequalitiesFirst QuadrantGraphical SolutionBounded RegionGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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