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Which point is not in the region formed by (x\ge 0), (y\ge 0), (x+y\le 8), and (y\le 2)?

Answer and explanation

Correct answer: ((3,3))

A point belongs to the required region only when it satisfies every inequality at the same time. The first two conditions place the point on or to the right of the y-axis and on or above the x-axis. The third condition keeps it on or below the line x+y=8, while the fourth keeps its y-coordinate at most 2.

For (6,2), both coordinates are nonnegative, 6+2=8, and 2≤2, so it is included. For (7,1), 7+1=8 and its y-coordinate is allowed. The origin also satisfies all conditions. For (3,3), although the coordinates are nonnegative and 3+3≤8, its y-coordinate is 3, which is greater than 2. Therefore, (3,3) is outside the common region, so choice C follows.

Related tags

Linear InequalitiesFeasible RegionPoint TestClass 11

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