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A linear relationship will show up on a graph as a straight line.
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.
circle graph
Proportional. linear
Line graph is used to show relationship between two variables.