3x-8y=-35 
- First thing you need move the 3x to the right hand like  this one 
  -8y=-3x-35 ( positive move to another side change to negative ) 
And then you need to move -8 to the right hand to ! 
y=-3/-8 -35/-8 so you need to change the negative to positive y=3/8 + 35/8 ( 3/8 mean 3 over 8 ) 
The answer is y= 3/8 + 35/8