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A thermometer.
You need to use a graphing calculator.Go to: Y = > Y = (type any number) > GraphYour line will be VERTICAL!!!!!!!!!|||||||||||||
A vertical line HAS NO slope! The slope is undefined in this case.
There is no such thing as exactly vertical because either it is vertical or it is not. You cannot have approximately vertical - it is not vertical, then. Vertical means at 90 degrees to the horizon (or horizontal).
That would be a bar graph.