Question 52386
Do you know the general form or standerd form of the linear equation:

{{{Y=mx+c}}}

So in U'r case

2x-4y=8
  -4y= 8-2x
    y= (-2x + 8)/-4
     = 1/2x - 2

So U'r equation is 

{{{ y = 1/2x - 2}}}

where 1/2 is slope and , -2 is y intercept