4. To ship a package, it costs $5 for shipping supplies and $0.75 for each pound the piece weighs. If Tori wants to ship a 12-pound package, how much would it cost?

  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.