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Question
Show that the solution set of the following linear inequations is empty set:
x − 2y ≥ 0, 2x − y ≤ −2, x ≥ 0, y ≥ 0
Solution
Converting the inequations to equations, we obtain:
x\[-\]2y = 0, 2x\[-\]y =\[-\]2, x = 0, y = 0
x\[-\] 2y = 0: This line meets the x-axis at (0, 0) and y-axis at (0, 0). If x = 1, then y = 1/2,
so we have another point (1, 1/2). Draw a thick line through (0, 0) and (1, 1/2).
We see that the origin (1, 0) satisfies the inequation x + 2y ≤ 3 So, the portion containing the (1, 0) represents the solution set of the inequation x\[-\]2y ≤ 02x \[-\]y =2: This line meets the x-axis at (\[-\]1, 0) and y-axis at (0, 2). Draw a thick line joining these points.
We see that the origin (0, 0) does not satisfy the inequation 2x \[-\]y\[\leq\]\[-\]y\[\leq\]\[-\]2
Clearly, x ≥ 0, y ≥ 0 represents the first quadrant.
We see in the figure that there is no common region in all the lines. Hence, the solution set to the given set of inequations is empty.
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