What is the equation in point slope from a line that goes through eight -4 and has a slope of negative 5/6

Which of the following is the formula for the sequence graphed below

My math teacher told my class to "steal" a 6th grade fraction word problem from the internet, word problems? : -p requirements: only a 1 step word problem. needs to be complex.

Does the point (1, sqrt 7) lie on circle shown.