Question: How to find the intersection of two graphs, x,y axes are list

q3.mw
Hi!

I have a problem:

Graph a (in blue) and graph c (in red) are plotted, the value of ax,ay and cx, cy are in list.

program as follows:(also in file q3.mw)

with(plots); ax := [13300, 17400, 12500, 20300, 12100, 22100, 11800, 23100, 11600, 23800, 11400, 24300, 11300, 24700, 11200, 25100]; ay := [.2, .2, .3, .3, .4, .4, .5, .5, .6, .6, .7, .7, .8, .8, .9, .9]; cx := [17700, 17900, 18200, 18500, 18900, 19300, 19900, 20700, 22700, 29600]; cy := [.1, .2, .3, .4, .5, .6, .7, .8, .9, .9]; display({plot(ax, ay, style = point, color = blue), plot(cx, cy, style = point, color = red)})

Problems are:

1.How to  find the intersection of graph a and b?

2. x, y in list are not in order, how can I connect each point?

Please help me, thank you!