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For plotting the graph, in the equation 3x + y = 9, what is the value of y when x = 2?

Answer and explanation

Correct answer: 3

Substituting x = 2 gives 3(2) + y = 9, so 6 + y = 9. Therefore, y = 9 − 6 = 3, and the corresponding point is (2, 3). The value 6 is only the value of 3x, not y. Exam tip: When preparing a table for graphing, substitute the chosen x-value first and then calculate y.

Related tags

Linear EquationsGraphical MethodTable Of ValuesCoordinate PointsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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