A direct relationship if the slope of the line is positive.
An inverse relationship if the slope of the line is negative.
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Linear equation.
It can be either a straight line through the origin or a hyperbola.
By definition, if you graph the relationship between two variables and the result is a straight line (of whatever slope) that is a linear relationship. If it is a curve, rather than a straight line, then it is not linear.
A straight line graph - is one possible answer.
It's a slanted straight line that goes through the origin of the coordinates.