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At which point do the lines \(3x+4y=31\) and \(3x-y=11\) intersect on the graph?

Answer and explanation

Correct answer: \((5,4)\)

The point of intersection is the common solution of both linear equations. Subtracting the second equation from the first gives \((3x+4y)-(3x-y)=31-11\), so \(5y=20\) and hence \(y=4\). Substituting \(y=4\) into \(3x-y=11\) gives \(3x-4=11\), which leads to \(x=5\). Therefore, the intersection point is \((5,4)\). As an exam tip, verify the ordered pair in both equations before selecting the answer.

Related tags

Intersection PointGraphical MethodLinear EquationsCommon SolutionCoordinate GeometryGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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