How can I interpolate a point in a x,y graph given only one of these values and being the point on the line?

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Diego Dranuta
Diego Dranuta 2019-9-12
I have a sets of graphs where I want to show 2 points on each plot. One on .5 (y value) and the other on .9 (also y value)
I have tried
plot(x,y)
hold on
plot(x(),y(.5),'r*')
But did not work out.
Any ideas?

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