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For the lines y=3x+2 and y=3x-4, what is the solution region of y≤3x+2 and y≥3x-4?

Answer and explanation

Correct answer: Closed strip between the two parallel lines

The two boundary lines have the same slope, 3, but different intercepts, 2 and -4, so they are distinct parallel lines. Combining the inequalities gives 3x-4≤y≤3x+2. Thus y must be at least the lower line and at most the upper line. The points satisfying both conditions lie in the strip between the two parallel lines. Since both inequalities use ≤ or ≥, equality is permitted, so both boundary lines belong to the solution set; the strip is closed. Therefore option A is correct. The regions above both or below both satisfy only one side of the compound condition, and the lines do not conflict, so the solution is not empty.

Related tags

Linear InequalitiesParallel LinesClosed StripCompound InequalityGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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