Jonathon created a graph that shows the number of exercises he completes in his workout routine. On a coordinate plane, a graph titled Jonathon's Exercises has number of crunches on the x-axis and push-ups on the y-axis. Points (15, 2), (30, 4), and (45, 6) are plotted.

Which statement summarizes his exercise routine?
Jonathon does 3 crunches for every 2 push-ups.
Jonathon does 2 push-ups for every 3 crunches.
Jonathon does 2 push-ups for every 15 crunches.
Jonathon does 15 push-ups for every 2 crunches.