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What is the graphical solution of the two lines represented by 3x − y = 7 and x + y = 5?

Answer and explanation

Correct answer: (3, 2)

In the graphical method, the intersection point of the two lines is the solution of the pair of equations. Adding the equations gives 4x = 12, so x = 3. Substituting this in x + y = 5 gives y = 2. Therefore, the intersection point is (3, 2). The nearby option (2, 3) is incorrect because 3(2) − 3 = 3, not 7. Exam tip: Verify a coordinate pair in both equations before selecting the answer.

Related tags

Graphical SolutionLinear EquationsIntersection PointCoordinate GeometryVerificationGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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