What is the slope of this here line?

3/5

Step-by-step explanation:

It rose 3 and ran 5 (rise over run)

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

8121 because

130,000 divided by 16 is 8121