Unless it is a direct proportion, the straight line does not have to start from zero.
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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