y = -2x + 8   would work

In fact.....any equation in the form   y = -2x + b      would work

Parallel means that the lines never touch, and for that to happen, they must have the same slope.

The slope of -2 means that an equation is y = -2x+4. In fact, the y-intercept doesn't matter because they are all parallel.

You are very welcome!

:P

let's start off by defining what a parallel line is: 
-same slope 
-different y intercept 

now let's analyze our equation y=-2x-3 
so now lets see our slope, and as we said; a parallel line must have the same slope, thus our slope will stay unchanged. (-2)
and lets see the y intercept. So the y-intercept needs to change and so you can put any value that is not equal to -3. 

example would be:
y=-2x+5 

hope this helped! :)

Thanks for your help everyone!!