Ratio of pens to pencils is 4: 5, if there are 120 pens how many pencils are there?

120/4 = 30

5 * 30 = 900

120 pens : 900 pencils

If there are 120 pens, there are 900 pencils.

  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.