All I know is x is 81 degrees
For this case we have that by definition, the slope of a line is given by:

Where:
and
are two points through which the line passes
According to the statement we have:

Substituting we have:

Thus, the slope of the line is:

Answer:

The largest is 0.530000 because it is closest to 1. The 5 is the largest in the tenths place.
Answer = -1/6
Solutions in the picture attached