To interpret the y-intercept in the context of a situation involving costs, it is important to clarify that the y-intercept represents the starting point or initial value when the independent variable (often time) is zero.
Based on the responses provided, the most appropriate interpretation of the y-intercept would be:
The initial cost is $10 for the subscription.
This means that when no time has passed (i.e., when the subscription has just started), the cost associated with it is $10. If you had a graph showing the total cost over time, the y-intercept would indicate that at the very beginning (time = 0), the cost incurred is $10.