Are you kidding me?

1. -3X + 2Y = -6
2Y = 3X - 6
Y = (3X/2) - 3

^ The parenthesis aren't necessary when writing it, but I wanted to make it clear that the 3X/2 is NOT 3X/2-3. There's a huge difference.

2. X+1/2Y= 4
2Y = 4/X+1
Y = 4/X+1/2
Y = 4/2X+2
Y = 2 / 2X

3. 1/4X + Y = 8
Y = (-1X/4) + 8

^ Same reason I put in the parenthesis as above.

That seems about right to me.