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At which point do the lines \(x+3y=10\) and \(2x+3y=14\) intersect?

Answer and explanation

Correct answer: \((4,2)\)

Subtracting the first equation from the second gives \(x=4\). Substituting this into \(x+3y=10\) gives \(4+3y=10\), so \(y=2\). Therefore, the lines intersect at \((4,2)\). The distractor \((2,4)\) satisfies the first equation but gives \(2(2)+3(4)=16\neq14\), so it is not the common solution. In an exam, verify an intersection point in both equations.

Related tags

Graphical MethodIntersection Of LinesPair Of Linear EquationsSimultaneous EquationsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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