What is the equation of the line that passes through the point (4 5 and has an undefined slope)

x = 1 (the line intersects the x-axis at 1, and is parallel to the y-axis)We cannot write the equation on the Slope-intercept form, since the slope of the line is undefined. 1 is the x-coordinate of any point on the given line.

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.         x = 4. Vertical line passing through the given point.