Domain And Range Vertical Line

The notation for domain and range sets is like x 1 x 2 or y 1 y 2 where those numbers represent the two extremes of the domain furthest left and right or range highest and lowest and the square brackets indicate that those numbers are included in the range. If you present x as a function of y such that x f y where f y 5 then your domain is all real numbers which on a cartesian plane is a vertices line and your range is 5. If you had an open point on a line this indicates that that exact point.