Question

Is the following relation a function? (4,2), (1,1), (0,0), (1, -1), (4, -2). Give the domain and range.

Answer 1

D:{4,1,0,1}
R:{2,1,0,-1,-2}

It's not a function because the domain values repeat.

Answer 2

f(4) = ? :::: there is no solution ; that is not function

Answer 3

Functions cannot have two of the same value of 'x'..

Here it says (4, 2) and (4, -2). Therefore, it is not a function.

Answer 4

right - or to put it another way you can't have a one-to-many relation in a function