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If the lines \(kx+4y=22\) 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 \((2,4)\) must satisfy both line equations. Substituting \(x=2\) and \(y=4\) into the first equation gives \(2k+4(4)=22\), or \(2k+16=22\). Hence, \(2k=6\) and \(k=3\), so option B is correct. As a check, the point also satisfies the second equation because \(2+4=6\). Exam tip: when the intersection point is given, substitute its coordinates into the equation containing the unknown parameter.

Related tags

ParameterGraphical MethodLine IntersectionGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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