I am not good at equations I need to complete this chart for this problem...

y=-1/2x-4

X y (x,Y)
__ -1 ____
-2 __ ____
__ -4 ____
2 ___ ____
8 ___ ____

I tried the first problem but I do not think it is correct..

y=-1/2x-4
x=-1

y=-1/2(-1)-4 = -3 1/2

that doesn't seem right can someone please help me??