Please see the pic, I'd solved in it.
Divide 19.99 / 3
Get 6.663
Round to 6.66
Unit rate for 3 pizzas at 19.99 is 6.66
3a-2 is equivalent to (3a)-2
Hope my answer helped:)
The table is proportional, cause there all plus four.
-2 + 4 = 2
0 + 4 = 4
2 + 4 = 6
4 + 4 = 8
Hope it helps
