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What is the intersection of the lines x = 3 and x + 2y = 11?

Answer and explanation

Correct answer: (3, 4)

The governing idea is that a point at the intersection of two lines must satisfy both equations simultaneously. The first line fixes the x-coordinate at 3. Substitute x = 3 into the second equation: 3 + 2y = 11. Subtracting 3 gives 2y = 8, and division by 2 gives y = 4. Thus the common point is (3, 4), so option B is correct. A frequent error is to interchange the coordinates and choose (4, 3), but x = 3 rules that out immediately. Option C has the correct x-coordinate but fails because 3 + 2(2) = 7, not 11. Option D also fails the vertical-line condition because its x-coordinate is 5. Substitution into both original equations is the reliable verification method.

Related tags

Straight LinesLine IntersectionSimultaneous EquationsCoordinate GeometryVarious Forms Of The Equation Of A LineMathematicsClass 11 Mcq

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