They are straight lines through the origin and their gradient is the constant of proportionality.
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Do all linear graphs have proportional relationship
Either a straight line through the origin or a hyperbola.
Graphs are pictorial representations of relationships.
Graphs help you see relationships in things such as inflation in money, or rising population.
graphs give a trend of variables and the trend can be studied using the the extent they usually portray and the graphs are not emperical methods they give interpolated relationships hence a reduced uncertainities