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If the graphs of the equations \(5x-y=19\) and \(x+y=5\) intersect at \((p,q)\), what is the value of \(p-q\)?

Answer and explanation

Correct answer: 3

In the graphical method, the intersection point of the two lines represents the common solution of both equations. From \(x+y=5\), we get \(y=5-x\). Substituting this in \(5x-y=19\) gives \(5x-(5-x)=19\), so \(6x=24\) and \(x=4\). Consequently, \(y=1\), hence \((p,q)=(4,1)\) and \(p-q=4-1=3\). Therefore, option C is correct. Exam tip: the coordinates of the intersection of two lines give the simultaneous solution of their equations.

Related tags

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

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