Question: Marking an intersection of point plots in Maple

I have the following program in Maple:

my_array := [[.1, .1], [.3, .45], [.55, .78], [.8, .9]]; #define an array of points
my_graph := pointplot(my_array, connect = true); #plot the array on a graph, connecting points
line := plot(.7, x = 0 .. 1); #plotting a horizontal line
display(my_graph, line); #displaying on the same graph

The output looks as follows:


I want to add a vertical line corresponding to the intersection of these two lines. Is there a way to do it?

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