The answer is -1/4. You count up to give you 3 and then over which will give you 12. Technically the answer would be -3/12 but since you are able to simply it, you can simplify by 3. 3/3=1 and 12/3 is 4. So since the line is going down, it would be a negative slope so therefore, it would be -1/4. i hope that makes sense.
