In triangle, prove that tan A -cot B - cot C=tanA. cotB. cotC

What is the equation in point slope form of the line that passes through the point (-1, -3) and has a slope of 4? y-1=4(x-3) or y+3=4(x+1)

Triangle abc is reflected over the line y=x triangle abc has points (-6,-,-1) and (-5,-6) what is the c coordinate

Which system of linear inequalities is graphed? can somebody pleasssse