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straight line
If it is a straight line through the origin then it represents a direct proportion.
A kind of weird line that is straight.
Unless it is a direct proportion, the straight line does not have to start from zero.
If the variables x and y are in direct proportion then the graph of y against x is a straight line through the origin. If the variables x and y are in inverse proportion then the graph of y against x is a rectangular hyperbola. Alternatively, the graph of y against 1/x (or 1/y against x) is a straight line through the origin.