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The vertex ((1,2)) of the region formed by (x=1), (y=2), and (x+y=8) is formed by which two boundaries?

Answer and explanation

Correct answer: (x=1) and (y=2)

The direct answer is option D: the vertex (1,2) is formed by x = 1 and y = 2. A vertex is commonly obtained where two boundary lines intersect. Check the point in x = 1: its x-coordinate is 1, so it lies on that boundary. Check it in y = 2: its y-coordinate is 2, so it also lies on that boundary. The third boundary gives x + y = 1 + 2 = 3, not 8, so the point is not on x + y = 8. Option A is wrong because (1,2) does not satisfy x + y = 8. Option B is wrong for the same reason. Option C is wrong because one line alone does not determine an ordinary intersection vertex. Option D is correct. Memory cue: test a vertex by substituting its coordinates into each boundary equation.

Related tags

Linear InequalitiesVerticesBoundary LinesClass 11

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