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What is the graphical solution, that is, the point of intersection of the lines \(x+3y=15\) and \(x+y=7\)?

Answer and explanation

Correct answer: (3,4)

The coordinates of the intersection point must satisfy both equations. Subtracting the second equation from the first gives \((x+3y)-(x+y)=15-7\), so \(2y=8\) and \(y=4\). Using \(x+y=7\), we get \(x=3\). Therefore, the intersection point is \((3,4)\). For example, the close distractor \((4,3)\) satisfies the second equation but not the first. Exam tip: The graphical solution is the common point of both lines.

Related tags

Graphical MethodIntersection PointLinear EquationsCoordinate GeometryGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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