Practicing Success

Target Exam

CUET

Subject

-- Mathematics - Section A

Chapter

Determinants

Question:

The region represented by the system of inequalities $x, y ≥ 0 ;-2 x+y ≤ 4 ; x+y ≥ 3$ and $x-2 y ≤ 2$ is :

Options:

unbounded in first quadrant

unbounded in first and second quadrant

bounded in first quadrant

not feasible

Correct Answer:

unbounded in first quadrant

Explanation:

Plotting graph for given inequalities

x, y ≥ 0 ⇒ Graph in 1st Quadrant

plotting → -2x + y = 4, x + y = 3, x - 2y = 2

lines first

  -2x+y=4     x + y = 3    x - 2y = 2
   

 x 

 0 

 -2 

y

4

0

   
  

 x 

0

 3 

 y

 3 

 0

  
 

 x 

 0 

 2 

y

 -1 

0

  

Now checking regions 

-2x + y ≤ 4

checking for (0, 0) point

-2(0) + 0 ≤ 4

0 ≤ 4

hence side containing (0, 0) contains solution

 x + y ≥ 3 

for (0, 0)

0 ≥ 3

side not containing (0, 0) is solution region

 

 x - 2y ≤ 2 

for (0, 0)

0 ≤ 2 

side containing (0, 0) is solution region

 

Option 1 → region is unbounded in first quadrant