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At which point do the lines \(2x+y=16\) and \(x-2y=-8\) intersect on the graph?

Answer and explanation

Correct answer: \(\left(\frac{24}{5},\frac{32}{5}\right)\)

The intersection point is the common solution of both linear equations. From the first equation, \(y=16-2x\). Substituting this into the second equation gives \(x-2(16-2x)=-8\), so \(5x=24\) and \(x=\frac{24}{5}\). Therefore, \(y=16-2\left(\frac{24}{5}\right)=\frac{32}{5}\). Hence, the intersection point is \(\left(\frac{24}{5},\frac{32}{5}\right)\). Exam tip: verify the ordered pair in both original equations; \((4,8)\) satisfies the first equation but not the second.

Related tags

Graphical MethodLinear EquationsIntersection PointCommon SolutionSubstitutionGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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