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Which point is obtained on the graph of the equation x + y = 8 when x = 5 is substituted?

Answer and explanation

Correct answer: (5, 3)

Substituting x = 5 in the equation gives 5 + y = 8, so y = 3. Therefore, the required point is (5, 3). In option B, the x- and y-values are written in the reverse order, whereas a point is always written as (x, y). Exam tip: Verify a point by substituting both coordinates into the equation.

Related tags

Linear EquationsGraphical MethodOrdered PairsCoordinate GeometryGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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