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For the two variables x and y, the equations \(2x+2y=72\) and \(3x-3y=18\) are given. What is the point of intersection of the graphs of these two linear equations?

Answer and explanation

Correct answer: \((21,15)\)

Simplifying the equations gives \(x+y=36\) and \(x-y=6\). Adding them yields \(2x=42\), so \(x=21\). Substituting this into \(x+y=36\) gives \(y=15\). Therefore, the graphs intersect at \((21,15)\). Option B incorrectly reverses the values of x and y, so it is not the solution. Exam tip: In the graphical method, the point of intersection represents the common solution of both equations.

Related tags

Graphical MethodLinear EquationsPoint Of IntersectionSimultaneous EquationsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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