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Using the graphical method, at which point do the lines \(x+2y=6\) and \(2x+y=6\) intersect?

Answer and explanation

Correct answer: \((2,2)\)

The point of intersection must satisfy both equations. Subtracting the equations gives \(x-y=0\), so \(x=y\). Substituting this in \(x+2y=6\) gives \(3x=6\), hence \(x=y=2\). Therefore, the lines intersect at \((2,2)\). Exam tip: verify a candidate point in both equations; \((4,1)\) satisfies the first equation but not the second.

Related tags

IntersectionGraphical SolutionLinear EquationsCoordinate GeometryGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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