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If the lines x + y = 9 and x − y = 1 meet, what is their intersection point?

Answer and explanation

Correct answer: (5, 4)

The governing idea is that an intersection point must satisfy both linear equations simultaneously. Add the equations to eliminate y: (x + y) + (x − y) = 9 + 1, giving 2x = 10 and therefore x = 5. Substitute x = 5 into x + y = 9: 5 + y = 9, so y = 4. Hence the lines meet at (5, 4), and option B is correct. A reverses the coordinates; although 4 + 5 equals 9, the second equation would give 4 − 5 = −1 rather than 1. For C, 6 + 3 is not 9, and D fails the second equation as well. Substitution into both original equations confirms the answer uniquely.

Related tags

Intersection-PointSimultaneous-EquationsGraphical-SolutionGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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