Your correct, +1 would give you one point on y line then go down and over to get your slope, so yes you are correct, good job.
Use a protractor it will help a lot that what I am doing in class you see the little hole on the protractor right you put were you see the dot and put the hole on the dot then you make the line and then it will give your answer
-3x to the second power - 2
I believe this is your answer.
Need a picture to tell for sure, sorry