Inverse variation does not pass through the origin, however direct variation always passes through the origin.
Chat with our AI personalities
Assuming both the scales on the graph are linear (that is to say that the numbers go up evenly) then YES, a graph which shows direct proportion must be a straight line. It must also pass through the origin (0,0). A straight line which does not pass through the origin is NOT showing direct proportion. Duncan
Slope = 1Y-intercept = 0Y = X
the origin is the point in the graph that can be fourth vertex
(0, 0)
inverse linear or quadratic