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Give the geometric representations of 2x + 9 = 0 as an equation

(1) in one variable

(2) in two variables

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(1) In one variable, 2x + 9 = 0 represents a point x = -9/2 = -4.5

(2) In two variables, 2x + 9 = 0 represents a straight line passing through point (−4.5, 0) and parallel to y-axis. It is a collection of all points of the plane, having their x-coordinate as 4.5.

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