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What is the point of intersection of the graphs of \(4x-y=9\) and \(2x+3y=23\), that is, their graphical solution?

Answer and explanation

Correct answer: Point: \(\left(\frac{25}{7},\frac{37}{7}\right)\)

From the first equation, \(y=4x-9\). Substituting this in the second equation gives \(2x+3(4x-9)=23\), so \(14x=50\) and \(x=\frac{25}{7}\). Therefore, \(y=4\left(\frac{25}{7}\right)-9=\frac{37}{7}\). Hence, the intersection point of the two lines is \(\left(\frac{25}{7},\frac{37}{7}\right)\). In option B, the coordinates are interchanged, so the point does not satisfy the equations. Exam tip: Always substitute the intersection point into both original equations to verify it.

Related tags

Pair Of Linear EquationsGraphical MethodIntersection PointSimultaneous EquationsCoordinate GeometryGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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