Trend Line Future Value

I can't seem to get a handle on this probably very simple task. I am writing an EA, and I have two price coordinates and two time coordinates, ( say Time [0+n] and Time[0+1] so I am looking at say Time[1] and say Time[11] where Time[11] is my first Trend line coordinate and Time[1] is my second ) for a trend line I am drawing as an object. I am trying to figure out what the value of the next point on the Trend line will be at Time[0].

I have done this before years ago, and I am damned if I can remember how. LOL

Apologies for asking such a basic question. Help Please

Use bar numbers instead of time.

Have you already tried ObjectGetValueByShift() with a negative shift? Functions that also might be useful are iTime() and iBarShift() for converting times and shifts into each other.

I knew it was simple thanks. ObjectGetValueByShift() That is the function I forgot about. I just could not remember it.

BTW, thanks for that great Equity Record mqh. Very impressive

I think the basic formula for slope (or a point on a line?) is y=mx+b, and from that you can compute other values. Do an internet search on slope, different formulas. ...
Or ..., if you really want to get into math: use trig ;=)