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For the two variables \(x\) and \(y\), the equations \(5x+5y=140\) and \(6x-6y=24\) are given. In the graphical method, what is the point of intersection of these two lines, i.e. the solution?

Answer and explanation

Correct answer: \((16,12)\)

Dividing the first equation by 5 and the second by 6 gives \(x+y=28\) and \(x-y=4\). Adding these equations yields \(2x=32\), so \(x=16\), and consequently \(y=12\). Therefore, the intersection point of the two lines is \((16,12)\). In option B, the coordinates are reversed; it satisfies \(x+y=28\) but gives \(x-y=-4\), so it is incorrect. Exam tip: In the graphical method, the common point of the two lines represents the solution of the pair of equations.

Related tags

Graphical MethodLinear EquationsIntersection PointSimultaneous EquationsCoordinate GeometryGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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