Answer:
Explanation:

To find the y-intercept, set a = 0 and solve for y.

This equation is undefined for k ≥ 0.
There is a y-intercept only if k < 0. Only then can the argument of the log function be positive.
The y-intercept is at

For example, if b = 2 and k = -3, log₂(3) = 1.585
The intercept is at (0, 1.585).