Subsitute values for x and evaluate to get values for y
when x=5, y=1
when x=0, y=-1
when x=-5, y=-3
remember, ordered pairs are in (x,y) form
so 3 ordered pairs are
(5,1)
(0,-1)
(-5,-3)
You find a common greatest factor, which in this case is 7. 1/4 is your answer.