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What is the solution of 3x − y = 10 and 2x + y = 15 on the graph?

Answer and explanation

Correct answer: (5, 5)

The governing concept is that the graphical solution is the intersection point, which must satisfy both equations. Add the equations to eliminate y: (3x − y) + (2x + y) = 10 + 15. This gives 5x = 25, so x = 5. Substitute x = 5 into 3x − y = 10: 15 − y = 10, hence y = 5. Therefore the lines intersect at (5, 5), so option A is correct. Verification in the second equation gives 2(5) + 5 = 15, confirming the point. Options B, C, and D do not satisfy both equations simultaneously, even if one may appear close on an inaccurately drawn graph.

Related tags

Intersection PointElimination MethodGraphical SolutionSimultaneous EquationsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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