If the equation is y=-1/2x-4 complete the box
X Y (x,y)
-1
-2
-4
2
8
There is no box. Your equation is ambiguous without parentheses.
It could be 1/(2x-4), 1/(2x) -4, (1/2)(x-4) or (x/2) -4
They are NOT the same.
Please correct this matter in your future posts.