One of the following sets of ordered pairs represents a proportional relationship. Which equation represents that relationship?
1: (0, 3), (3, 6), (6, 9), (9, 12)
2: (0, 0), (2, 8), (4, 16), (5, 20)

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.