Exercises 13-20. Find the domain and the range of each relation. 13. For all x, y ER, xRy if and only if x = ly. 15. For all x, y R, xRy if and only if e* = e'. = 16. For all x, y E R, xRy if and only if [[x]] greatest integer that is less than or equal to x. N, xRy if and only if xly. 17. For all x, y E 10. For all x, y 19. For all x, y 5171 = 4, My 11 ER, xRy if and only if x + y = 1. 14- Iyll. The symbol [x] stands for the