Answer:
3.5
Step-by-step explanation:
The constant rate of proportionality, k, is expressed as [tex]k = \frac{y}{x}[/tex], and shows that two quantities are proportional to each other. In this logic, rearranging this in terms of y gives us:
[tex]y = kx[/tex]
Thus we can determine that k is 3.5, in this case.
