(1,2), (1,3) , (1,4) , (1,5)......this is not a function because a function will NEVER have repeating x values...they can have repeating y values, just not the x ones.
a line with a slope of 0....... learn this... HOY -- horizontal line, 0 slope, represented by y = a number VUX -- vertical line, undefined slope, represented by x = a number so ur line with a slope of 0 is : y = (pick a number...any number)....y = 4 or y = 5 or y = 6...etc
