A proportional relationship between two variables is characterized by a constant ratio between them, which can be represented by a straight line passing through the origin (0,0) on a coordinate plane.
In the case of a graph that displays a curved line with two curves, it suggests that the relationship between the two variables is not constant but instead changes as the values increase. This indicates that the ratio of the two variables is not constant, which means the relationship is not proportional.
To summarize, the graph you described does not represent a proportional relationship because it is curved rather than a straight line that passes through the origin.