Give the geometric representations of 2x + 9 = 0 as an equation in two variables.

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#### Solution

In two variables, 2*x* + 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.

Concept: Equations of Lines Parallel to the X-axis and Y-axis

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