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Which of the following pairs has its lines intersecting on the y-axis?

Answer and explanation

Correct answer: 2x+y=6, 3x+y=6

Every point on the y-axis has x=0. In option A, substituting x=0 in both equations gives y=6, so the lines intersect at (0,6), which lies on the y-axis. For example, option B gives x=4 and y=2 on solving, so its intersection is not on the y-axis. Exam tip: To test whether the intersection lies on the y-axis, put x=0 and check whether both equations yield the same value of y.

Related tags

Graphical MethodY-Axis IntersectionLinear EquationsCoordinate GeometrySubstitutionGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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