The first one is Function 4. The y intercept is wherever the slope intercepts the Y axis, which would only be once if it is a true function. You can see that function 1's y intercept is 5. Function 2's is-4. Function 3's is -2. Function 4 tells you it's/ y intercept is 1. The one that's closest to 0 is number 4. As for the second one, the answer is function 1. I'm not positive on the third one, but can say function 4 is an answer.
