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If the lines \(x+ay=10\) and \(2x-y=5\) intersect at the point \((3,1)\), what is the value of \(a\)?

Answer and explanation

Correct answer: 7

The intersection point \((3,1)\) lies on both lines. Substituting \(x=3\) and \(y=1\) into the first line gives \(3+a(1)=10\), so \(a=7\). The second equation also checks correctly: \(2(3)-1=5\). Exam tip: Substitute the given point into the equation containing the unknown parameter.

Related tags

Pair Of Linear EquationsGraphical MethodIntersection PointSubstitutionParameterGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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