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Do all linear graphs have proportional relationship
A linear relationship means that the slope of the line is proportional, which means that the line is straight. In contrast to the linear realtionship, the non-linear relationship's slope is not proportional and the line will curved and not straight. Formula of calculating the slope is the difference of y divided by the difference of x.
It is an expression, not an equation and so cannot be proportional nor non-proportional.
rational number
If it is a 2-dimensional figure then it is proportional.