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The constant of proportionality is 1.3.
To find the constant of proportionality, you can divide the y-value by the x-value, for example:
2.6 / 2 = 1.3
3.9 / 3 = 1.3
7.8 / 6 = 1.3
13 / 10 = 1.3
Therefore, the constant of proportionality in this case is 1.3.