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What is the common solution of (y>1) and (y<1)?

Answer and explanation

Correct answer: empty set

A common solution must satisfy both inequalities at the same time. The statement \(y>1\) describes all points whose vertical coordinate is above 1, while \(y<1\) describes all points whose vertical coordinate is below 1. A number cannot be strictly greater than 1 and strictly less than 1 simultaneously. The boundary value \(y=1\) is excluded from both inequalities because both signs are strict.

To see this algebraically, a common value would have to obey \(1<y<1\). No real number can lie strictly between the same number and itself. Therefore the intersection of the two solution regions is empty, represented by \(\varnothing\). The line \(y=1\) is not a solution, and neither a whole strip nor the first quadrant describes the intersection. Hence option C is correct.

Related tags

Linear InequalitiesNo SolutionHorizontal Half PlanesClass 11

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