Answer:If f(x) = 3x, then to find the value of f(-1), you can substitute -1 in place of x. So, f(-1) would be equal to 3 times -1, which is -3.
Step-by-step explanation:If we have the function f(x) = 3x, we can find the value of f(-1) by substituting -1 in place of x. So, f(-1) would be equal to 3 times -1, which gives us -3.