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What is the point of intersection of the lines \(4x+y=18\) and \(x+y=9\)?

Answer and explanation

Correct answer: Point \((3,6)\)

The intersection point must satisfy both line equations. Subtracting the second equation from the first gives \(3x=9\), so \(x=3\). Substituting this into \(x+y=9\) gives \(y=6\). Therefore, the intersection point is \((3,6)\). For example, option C satisfies \(x+y=9\), but \(4x+y=21\), so it is incorrect. Exam tip: always verify the obtained point in both equations.

Related tags

Pair Of Linear EquationsGraphical MethodPoint Of IntersectionCoordinate GeometryGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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