Can someone with my friends math homework

The only thing you have to do is to substitute the x value from the table to the rule that they give you (y=-2x)
ex: (this is answer for the first slot where x is -4)
y= -2(-4)
y= 8
so your first point would be (-4, 8)
(repeat it for the rest of the values until you have enough points to graph your line)
~Hope this Helps~ ^^

Where is the graph function?

The answer would be c