The y-intercept is the the point where the graph cuts the y-axis which is in this case (0.1000).
The y-intercept is $1000.
The y-intercept represents the intial value of the antique.
Thus, option (B) is the correct option.
Part 2:
The value of x-values are non-negative becaue it shows the age of the antique which always increases with the time. Hence it cannot be negative.