I need to know how to solve this.I was sure I was correct but it appears not.Can someone tell me what I did wrong?

Answer:
Step-by-step explanation:
slope=(y2-y1)/(x2-x1)=(2-3.5)/(-6+9)=-1.5/3=-1/2=-0.5
Answer:
Slope = -2
Step-by-step explanation:
5/3 = -2.5/-1.5
Therefore, if you keep increasing the x by 3 then the y will keep decreasing by -1.5
3/-1.5 = -2