I believe the answer is C
Step-by-step explanation:
If you move -1/2x to the other side, the equation will become
y=-10+1/2x
You then can arrange the equation to y=mx+b so you would then have
y=1/2x-10
We now know that this is the answer because m is your slope so the 1/2 is the same slope as the slope in your given equation.
Hope this helps!