Two points. An intercept and an angle. Answer: When the equation of the line has x as a simple multiple of y, the line is straight (e.g x=m+by)
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A straight line on a distance - time graph represents a "constant velocity".
A straight line with a positive slope on a position-time graph is the graph of an object that's moving in a straight line with constant speed.
Linear = Straight line! So, a graph of a linear relationship is a straight line.
a graph that does not have a straight line...
straight line