Subspaces of r2? if yes, prove both closures in the abov exercise 1: which of these subsets w are theorem. if not, which closure is violated? {(n, 0) n is an integer. a. the subset of integers along the x-axis. that is, w = b. the subset w of all points (x, y) in the plane such that xy 2 0 (x, y) y x c. the subset w of all points along the line y = x. that is, w