What is the slope of a line that is perpendicular to the line y = 1/6x +4?

The slope of the line is

If i’m not wrong i believe it is c

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?