CBSE Class 12 Mathematics Linear Programming Q #1737
COMPETENCY BASED
APPLY
1 Marks 2026 AISSCE(Board Exam) MCQ SINGLE
The region represented by the system of inequations $3x+y\ge 3$, $2x-y\ge -5$, $x, y\ge 0$ is:
(A) unbounded in $1^{st}$ quadrant
(B) bounded in $1^{st}$ quadrant
(C) unbounded in $2^{nd}$ quadrant
(D) bounded in $2^{nd}$ quadrant
Correct Answer: B

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Detailed Solution

Step 1: Analyze the constraints

The system of inequations is given by: $$3x + y \ge 3$$ $$2x - y \ge -5$$ $$x \ge 0, y \ge 0$$ The condition $x, y \ge 0$ restricts the feasible region to the 1st quadrant.

Step 2: Plot the boundary lines

Line 1: $3x + y = 3$. Intercepts are $(1, 0)$ and $(0, 3)$. The region $3x + y \ge 3$ is away from the origin. Line 2: $2x - y = -5$ or $y = 2x + 5$. Intercepts are $(-2.5, 0)$ and $(0, 5)$. The region $2x - y \ge -5$ (or $y \le 2x + 5$) includes the origin side.

Step 3: Determine the nature of the region

Since the region is restricted to the 1st quadrant ($x, y \ge 0$), we look at the intersection of the half-planes. The line $3x + y = 3$ starts from $(1, 0)$ and goes to $(0, 3)$. As $x$ increases, $y$ can increase indefinitely along the line $y = 2x + 5$ while satisfying the inequalities. Because the region extends infinitely in the positive direction of the axes, it is unbounded.

Final Answer: unbounded in 1st quadrant

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must apply the graphical method of solving linear programming constraints to determine the geometric properties of the feasible region.
Knowledge Dimension: PROCEDURAL
Justification: The student follows a sequence of steps: identifying intercepts, plotting lines, testing points, and interpreting the intersection of half-planes.
Syllabus Audit: In the context of CBSE Class 12, this is classified as COMPETENCY. Linear Programming is a core unit where students must visualize regions to solve optimization problems.