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At which point do the lines \(2x+3y=18\) and \(x-3y=-6\) intersect on the graph?

Answer and explanation

Correct answer: \(\left(4,\frac{10}{3}\right)\)

The intersection point is the common solution of both equations. Adding the equations gives \(3x=12\), so \(x=4\). Substituting this into \(x-3y=-6\) gives \(4-3y=-6\), hence \(y=\frac{10}{3}\). Therefore, the intersection is \(\left(4,\frac{10}{3}\right)\). Option B incorrectly reverses the coordinates. Exam tip: After reading an intersection point from a graph, verify it in both equations.

Related tags

Pair Of Linear EquationsIntersection PointGraphical MethodFraction CoordinatesCommon SolutionGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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