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What is the common graph of \(x+2y\leq 8\) and \(x+2y>4\)?

Answer and explanation

Correct answer: Strip closed on one side and open on the other

The two inequalities describe the points lying between two parallel boundary lines. The first condition, \\(x+2y\\leq8\\), includes the line \\(x+2y=8\\), because equality is allowed. The second condition, \\(x+2y>4\\), excludes the line \\(x+2y=4\\), because equality is not allowed. Their common solution is therefore the region between these lines.

Combining the conditions gives \\(4<x+2y\\leq8\\). On a graph, the boundary for 8 is drawn as a solid line, while the boundary for 4 is drawn as a dashed line. The region between them is shaded, so it is a strip closed on one side and open on the other. Hence, option D is correct; it is neither empty nor only a boundary line.

Related tags

Linear InequalitiesStripMixed BoundariesCompound Inequality

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