Answer:

Explanation:
Slope is the change in y coordinates by change in x coordinates.
Or

Looking at the table, the change in each value of x is 10 (10 to 20 to 30 to 40).
Also, the change in each valueof y is -3 (20 to 17 to 14 to 11).
Note: change in y is negative since it is DECREASING.
Hence the slope would be -3/10