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What is the common region of x+2y≤10 and x+2y≥4?

Answer and explanation

Correct answer: strip between two parallel lines

The governing concept is intersecting two half-planes represented by linear inequalities. The boundary equations are x+2y=10 and x+2y=4. Their coefficients are identical, so the lines have the same slope and are distinct parallel lines. Combining the inequalities gives 4≤x+2y≤10. Thus a point is accepted when it lies on or between these two boundaries, producing the closed strip between them. The equality signs show that both parallel boundary lines are included. Option D is therefore correct. The common region is not empty; for example, (0,5) gives x+2y=10 and satisfies both conditions. It is not one line, because values such as x+2y=6 also work, and it is not the whole plane because points with x+2y<4 or x+2y>10 fail at least one inequality.

Related tags

Linear InequalitiesParallel LinesStripClass 11Graphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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