Get the y position by sending x to LineSeries

hi,
i created a LineChart from simple x,y points. now i would
like to get the y coordinate by sending some x to the specific
line. but i didn't find the function that do so!! how come flex
interpolate between point and uncover the function that draw the
whole line? is there a why to get the y value of the line from
cretin x?
please help me...

BLUP :0
PLEASE....

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