12 is the 4th term? Dont quote me on that though. I am 90% sure.
Sqrt x^2 y^8
The index is 2 so divide power by index
x y^4
Step-by-step explanation:
8)
describe y in terms of x
y=5+x
so now replace y with terms of x
5+x+3x=37
4x=32
x=8
y=13
9)
do the same here
x=y+1
2y+x=19
2y+y+1=19
3y=18
x=6
y=7