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At which point do the lines \(5x-y=13\) and \(x+2y=16\) intersect on the graph?

Answer and explanation

Correct answer: Point \(\left(\frac{42}{11},\frac{67}{11}\right)\)

From the first equation, \(y=5x-13\). Substituting this in the second equation gives \(x+2(5x-13)=16\), so \(11x=42\) and \(x=\frac{42}{11}\). Therefore, \(y=5\left(\frac{42}{11}\right)-13=\frac{67}{11}\). Hence, the graphs intersect at \(\left(\frac{42}{11},\frac{67}{11}\right)\). Option B incorrectly interchanges the \(x\)- and \(y\)-coordinates. Exam tip: Always substitute the intersection coordinates into both original equations to verify them.

Related tags

Graphical MethodLinear EquationsIntersection PointSubstitutionFraction SolutionGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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