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Which point lies in the solution region of (2x+5y\ge 10)?

Answer and explanation

Correct answer: ((3,1))

A point belongs to the solution region of an inequality when its coordinates make the inequality true after substitution. For \\(2x+5y\\ge10\\), the boundary is the line \\(2x+5y=10\\), and points on the accepted side give a value at least 10. Testing the listed points is the simplest reliable method.

For \\((1,1)\\), the left side is \\(2+5=7\\), which is less than 10. For \\((0,1)\\), it is 5, also less than 10. For \\((2,0)\\), it is 4, again less than 10. For \\((3,1)\\), it is \\(2(3)+5(1)=6+5=11\\), and \\(11\\ge10\\) is true. Hence only choice D lies in the solution region.

Related tags

Linear InequalitiesPoint TestSolution RegionClass 11

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