The correct answer is a.
Inside the function it says x+2, and a +2 means it is to the left (direction is opposite of the sign)
The 3 on the outside of the function shows how the steepness, or slope will change. The first is correct because slope is rise over run, and if you go from one point to another, you'll see that it is up 3 and over 1, or 3/1, or 3.
