Palindromic words with a veritcal axis of symmetry:
AHA, MA'AM, MAM, MOM, NON, NOON, OTTO, TOOT, YAY.
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Some 6 letter palindromes you may like:RedderHannah
Because in a vertical line the slope is undefined, there is no "y" answer or "b" value and the line is in the form of x = some number such as x = 3 which is a vertical line.
A vertical line!
A vertical line has an undefined slope. For the line to be parallel to a vertical line, the slopes would have to be the same. Therefore, the line parallel to a vertical line also has an undefined slope.
A horizontal line is a line perpendicular to the vertical.