Would anyone please be able to help me with this problem?

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

If the value of cos330°is√3/2 then find cos 165°.

20 points 1. your friend, taylor, missed class today and needs some identifying solutions to systems. explain to taylor how to find the solution(s) of any system using its graph. 2. taylor graphs the system below on her graphing calculator and decides that f(x)=g(x) at x=0, x=1, and x=3. provide taylor some feedback that explains which part of her answer is incorrect and why it is incorrect. f(x)=2x+1 g(x)=2x^2+1