Answer:
f(x) = -12
Step-by-step explanation:
The problem here is a simple plug and solve function. "y = f(x)" is just basically saying that y is a function of x. Whatever x-value is plugged in, the function will output a number.
In this case, the function is -4x, and the x value is 3. So, it is a simple multiplication problem;
y = -4x
y = -4(3)
y = -12
