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At which point do the lines \(6x-y=19\) and \(x+3y=22\) intersect on the graph?

Answer and explanation

Correct answer: Point \(\left(\frac{79}{19},\frac{113}{19}\right)\)

From the first line, \(y=6x-19\). Substituting this into the second equation gives \(x+3(6x-19)=22\), so \(19x=79\) and \(x=\frac{79}{19}\). Therefore, \(y=6\left(\frac{79}{19}\right)-19=\frac{113}{19}\). Hence, the intersection point is \(\left(\frac{79}{19},\frac{113}{19}\right)\). In option B, the values of \(x\) and \(y\) are interchanged. Exam tip: Substitute the ordered pair into both original equations to verify the solution.

Related tags

Pair Of Linear EquationsGraphical MethodIntersection PointSubstitutionFraction SolutionGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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