Answer:

Step-by-step explanation:
Given: 
We need to completely isolate
to solve.






Finally, multiply both sides by -2 to completely isolate
.

165\15= number of tubs
165 divided by 15 equals the amount of the tubs that he sold.
(I assume the two different name things, isaac&dominic, is a mistake since there isnt any information for Dominic)
1: (-1,2)
2: (2,5)
3: (3,0)
-1.4, -1.25, 1/25 is the answer
9 down 3 rt 4 rt 8 up 4 rt 5 down 8 down 9 (= 50)