1)Your current problem is in standard form. All you need to do is subtract your X value from both sides leaving you with
-8y= -24x+56
Then divide the entire thing by 8 in order to figure out what y equals
-8y= -24x+56
------------------
-8 -8 -8
If finding the value of Y, your answer should look like this:
y=3x-7
If finding the value of X, you would add your Y value to 56 on the right:
24x=8y+56
Then divide the whole thing by 24 and you get something funky like:
x=(1/3)y+(8/3)
* If in parenthesis, it's meant to be in fraction form.