Which ordered pair would form a proportional relationship with the point graphed below? 40
30
20
10
|-80-60-40-240
20 40 60 80 x
-20
(60.-20)
30
40
(-10.30)
(30, -15)
(-30, 10)
(80, -30)

Answer is either b or c

First locate the turning point (vertex) of the graph. which is at the coordinates x=5 and y=9 or (5; 9).to determine whether it's a maximum or mininum value, you have to discern whether the vertex's y-value is the highest value or lowest value the graph can reach. since the vertex's y-value, 9 is the highest value the graph can reach, it will be a maximum.another basic way to determine whether the vertex's value is max or min is to see if the graph is smiling or sad. if it's smiling, the turning point/vertex would be a minimum, while a sad parabola would have a maximum y-value at the vertex.