Final answer:
It is not possible to determine the value of y without additional information about the functions f and g.
Step-by-step explanation:
To solve for the value of y in the equation f(1) – 4 · g(4) = y, we need specific values for f(1) and g(4). However, with the given information, it is not possible to determine these values directly. Therefore, we can't calculate y without additional information or context that defines functions f and g.