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If the graphical intersection point of the lines \(4x-y=11\) and \(x+y=4\) is \((p,q)\), what is the value of \(p-q\)?

Answer and explanation

Correct answer: 2

The intersection point of the two graphs satisfies both equations. Adding the equations gives \(5x=15\), so \(x=p=3\). Substituting this into \(x+y=4\) gives \(y=q=1\). Hence, \(p-q=3-1=2\), so option B is correct. Exam tip: The intersection of the graphs can be found efficiently by solving the two linear equations simultaneously.

Related tags

Graphical MethodLinear EquationsIntersection PointSubstitutionGrade 10 MathematicsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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