Question 817039
Very easy to identify linear relationship.  Change x up by 1, change in y is down by 1.  If domain and range are as you show, then the function is a sequence.


For n going from 0 to 3, the function is the sequence {{{highlight(-1*n+5)}}}.
If this were a continuous function, you would say {{{y=-x+5}}} and {{{0<=x<=5}}}