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If the lines \(kx+2y=14\) and \(x+y=6\) intersect at the point \((2,4)\), what is the value of \(k\)?

Answer and explanation

Correct answer: 3

The intersection point must satisfy both line equations. The second equation is verified because \(2+4=6\). Substituting \(x=2\) and \(y=4\) into the first equation gives \(2k+2(4)=14\), so \(2k+8=14\), \(2k=6\), and hence \(k=3\). Exam tip: Substitute the coordinates of the given intersection point into the equation containing the unknown parameter.

Related tags

ParameterGraphical MethodLinear EquationsPoint SubstitutionGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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