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Linear = Straight line! So, a graph of a linear relationship is a straight line.
A linear relationship will show up on a graph as a straight line.
The graph must be a straight line, and it must pass through the origin.
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A graph shows a proportional relationship if it is a straight line that passes through the origin (0,0). This indicates that as one variable increases, the other variable increases at a constant rate. Additionally, the ratio of the two variables remains constant throughout the graph. If the line is not straight or does not pass through the origin, the relationship is not proportional.