explain whether the points (13,4), (-7,3), (-1,2), (5,1), (11,0), (17,-1) represents the set of all the solutions for the equation y= -1/6x + 11/6

Mr switzer needs to buy new 1-foot tiles to cover his bathroom floor. the floor is 12 feet long and 8 feet wide. each square foot of tile will cost $1.79. in dollars what will be the total cost of the tiles he needs to buy.

This is so hard and it’s for a test

Which statement justifies why angle ebc measures 90?