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For two variables x and y, the linear equations 3x + 3y = 99 and 4x − 4y = 28 are given. What is the solution of these equations by the graphical method?

Answer and explanation

Correct answer: (20, 13)

Dividing the first equation by 3 and the second by 4 gives x + y = 33 and x − y = 7. Adding these equations gives 2x = 40, so x = 20 and y = 13. Therefore, the intersection point of the two lines, and hence the graphical solution, is (20, 13). Option B reverses the coordinates; for (13, 20), x − y = −7, so it is incorrect. Exam tip: the point where the two graphs intersect represents the solution of the pair of linear equations.

Related tags

Graphical MethodLinear EquationsIntersection PointSimultaneous EquationsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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