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When the equations \(3x-2y=4\) and \(x+5y=23\) are represented graphically, which is their point of intersection, i.e. their graphical solution?

Answer and explanation

Correct answer: Point \(\left(\frac{66}{17},\frac{65}{17}\right)\)

From the second equation, \(x=23-5y\). Substituting this into the first equation gives \(3(23-5y)-2y=4\), or \(69-17y=4\), so \(y=\frac{65}{17}\). Therefore, \(x=23-5\left(\frac{65}{17}\right)=\frac{66}{17}\). Hence, the two lines intersect at \(\left(\frac{66}{17},\frac{65}{17}\right)\). In option B, the value of \(x\) is incorrect. Exam tip: The graphical solution is the common point of the two lines; verify the point by substituting it into both equations.

Related tags

Pair Of Linear EquationsGraphical MethodPoint Of IntersectionSubstitutionCoordinate GeometryGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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