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What is the \(x\)-coordinate of the point of intersection of the lines \(4x+5y=31\) and \(3x-2y=1\)?

Answer and explanation

Correct answer: \(\frac{67}{23}\)

The point of intersection must satisfy both equations simultaneously. Multiplying the equations by 2 and 5 respectively gives \(8x+10y=62\) and \(15x-10y=5\). Adding them yields \(23x=67\), so \(x=\frac{67}{23}\). Therefore, the x-coordinate of the intersection point on the graph is \(\frac{67}{23}\). The value \(3\) is incorrect because it does not satisfy the second equation. Exam tip: Always substitute the obtained coordinate into an original equation to verify a graphical answer.

Related tags

Pair Of Linear EquationsGraphical MethodIntersection PointX-CoordinateEliminationAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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