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I have recently been doing all these direct variation problems but not every linear relationship is a direct variation... But every direct variation is a linear relation!
no.
The line doesn't go through the origin
YES...A direct variation is a linear relationship in which y-intercept is always 0.
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.