Answer:
-30
Step-by-step explanation:
To find slope, subtract two y's and then subtract the x's in the same order.
12-(-18)=30=-30
11-12 -1
You could also switch the order like this...
-18-12=-30=-30
12-11 1
As you can see, both of the ways of solving for slope resulted in -30.
Hope this helps!! Have a great day :3