What is the slope of the line with equation y-3=-1(x-2)?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Don't know how to find x given these segment lengths

Hurrya vegetable garden and a surrounding path are shaped like a square that together are 11ft wide. the path is 2ft wide if one bag of gravel covers 9 square feet how many bags are needed to cover the path