Constant speed..
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I would like to state first that you misspelled horizontal. The answer to your question is Constant speed.
On a graph, you will have a vertical numbered line and a horizontal numbered line. The vertical one is called the "y-axis" and the horizontal is the "x-axis." You are either looking for a line, shape, or arc that touches, or "intercepts" on the x-axis (horizontal line).
When there is a curved line going upwards on a graph it means the distance is increasing
It shows that the pair mated. :)
Those are parralel lines.