17. Do these ratios form a proportion?
4 old cars to 12 new cars
6 old cars to 18 new cars

To check

4:12::6:18

4:12 in lowest form= 1:3

6:18 in lowest form= 1:3

So, The statement is true

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  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.