From the information which is available, you do not know.
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I would claim that a straight line is slightly bend as we define straight from the horizon.
If in the form of an equation, it has a variable with a power other than 0 or 1. If in the form of a graph, it is not a straight line.
A tangent at that point where a straight line just touches a curve and a secant line when the straight line bisects the curve.
The hands of the clock will form a straight line 12 times.
a straight line