The function that has a range of y is any linear or constant function where the output (y) is always greater than or equal to -4.
For example, the function f(x) = -4 is one such function. It doesn't matter what value of x you input; the output will always be -4, which is greater than or equal to -4.
Another example is a linear function like f(x) = 2x - 4. In this case, as long as x is any real number, the output (y) will always be greater than or equal to -4.
So, any constant function where the constant is greater than or equal to -4 or any linear function with a positive slope will have a range of y .