Can a number be a factor and a multiple of
itself?

Yes

Step-by-step explanation:

Example, the number 4:

Multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44

Factors of 4: 1, 2, 4

  y= -3x is the required function.

step-by-step explanation:

we have been given a table:

x             y

0             0

1             -3

3             -9

-2             6

we can see that the values of y is -3 times the value of x

hence, the function would be: y= -3x.

put the values of x will give the same y as in the table that means function is satisfying the given table.