Answer:
2,5 and 6
Step-by-step explanation:
you need to find equations that have addition so that you can subtract (using the subtraction property of equality) to isolate the variable. The only ones that have that are the 2nd, 5th and 6th.
The first, you need to use division and for the third and fourth, you use addition. You basically use the inverse/opposite of what it shows. Hope this helps!
