How do I complete each ordered pair so that is satisfies the given equation?

y=2x=2x+5:(8,),(-1,),(,-1)

your equation stated as y=2x=2x+5

makes no sense.

once you have determined the correct equation, for any given point, the first number is always the x value, and the second number the y value.
So just substitute the given value and solve the the missing one.