Nick o’ time, the plumber, charges $30 per hour. his brother ivan, the plumber’s , charges $20 per hour. nick starts working on a job. four hours later ivan joins him and both work until the job is finished. if they make a total of $470, how long did they work together?

7 hours

They worked together for 7 hours ($350 + $120)

  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.