GIVEN:
We are given the following function;

Required;
To graph the function and then find the y-intercept.
Step-by-step solution;
The function given is in the form;

This is an exponential function and x can take any value, which will determine the value of y. From the function we can determine that the initial value a is the point where x = 0 and at that point we have the y intercept, that is, when x = 0, then y = a.

Therefore, for the function given;

Therefore, the y-intercept here is 4. Note also that the value of b is 0.5, which is less than 1. This indicates that its an exponential decrease (exponential decay). Therefore, its downward sloping from left to right
The graph is shown below;
Therefore,
ANSWER:
Option C is the correct answer.
