Question 251951
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The line *[tex \Large x\ =\ 4] is a vertical line.  Any line perpendicular to that line must be a horizontal line with an equation *[tex \Large y\ =\ c] where *[tex \Large c] is some constant.  In order for the line to pass through a given point, *[tex \Large c] must be equal to the *[tex \Large y]-coordinate of the given point.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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