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For a pair of lines intersecting on the x-axis, what is the form of their intersection point?

Answer and explanation

Correct answer: (a, 0)

The governing coordinate-plane fact is that every point on the x-axis has y-coordinate equal to zero. The x-coordinate may be any real number, so it is represented by a parameter such as a. Consequently, if two lines meet on the x-axis, their common point must have the form (a, 0), making option B correct. Option A describes a general point on the y-axis because its x-coordinate is zero. Option C has equal coordinates and lies on the line y = x, not necessarily on the x-axis. Option D also has a generally nonzero y-coordinate, so it cannot lie on the x-axis unless a is zero, which is not the required general form.

Related tags

Linear EquationsGraphical MethodX-AxisIntersection PointGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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