A straight line graph plotted on the Cartesian plane
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A straight line which is not vertical.
The graph is a straight line.
If the graph is a straight line through the origin, sloping upwards to the right, then it is a proportional linear relationship.
The graph of a linear proportion will be a straight line passing through the origin. The equation will have the form y = mx, also written as y = kx.
It suggests that there is very little evidence of a linear relationship between the variables.