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How many points with integer coordinates are in the region (x≥0), (y≥0), (x+y≤4)?

Answer and explanation

Correct answer: (15)

The inequalities x≥0 and y≥0 restrict the points to the first quadrant, including the axes. For each integer x from 0 through 4, the condition x+y≤4 gives y=0 through 4-x. Thus the numbers of possible integer y-values are 5 when x=0, 4 when x=1, 3 when x=2, 2 when x=3, and 1 when x=4. Adding them gives 5+4+3+2+1=15. Equivalently, these points form a triangular lattice under x+y=4, including all boundary points. Therefore option B is correct. Counting only interior points or excluding the axes would produce smaller, incorrect totals.

Related tags

Linear InequalitiesInteger PointsCountingFirst QuadrantGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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