Ab - c = 9 |subtract ab from both sides
- c = 9 - ab |change signs
c = -9 + ab
c = ab - 9
1. x + y = 8 would be x= -y+8
2. x - y = 6 would be x= y+6
Hope this helps
25 days. If the kitten weights 100 grams, for it to triple it's original weight it must become 300 grams. A difference of 200 grams. 8 grams goes into 200 grams 25 times. Therefore the kitten takes 25 days to triple it's original weight.