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Have you watched the free lecture on Linear Programming?
In the lecture I explain in detail how to draw the line.All we need is the angle of the line. Presumably you are OK producing the equation for total contribution i.e. total contribution = ……
All we do is choose a number for total contribution – any number – and then draw the line for that equation. It does not matter what total contribution you choose, because the resulting line will be parallel, and it is only the angle of the line that is needed.
It is difficult to explain here without working through a full example.
If you watch the lecture then it should become clear.Honorable sir!
Whenever I open the lecturer i can’t seen the full scene.
Don’t know why….
Can u send the link or any other source which I can approach easily???Does the lecture play?
If it does, then at the bottom right of the bar at the bottom of the lecture, there is a double arrow – if you click on it then it will make it full screen.
Dear John,
I have watched the lecture part 1 of limiting factor and I am bit confused reagarding the ISO line. According your video we can guess any figure for contribution and draw the ISO line which we can move parallel to reach the point B where we have max contribution. My question is when I am picturing myself moving that line away from origin the number for E becomes more than 10 or if we guess that contribution is not 90 but 100 than E=11.11 , is it normal or I am missing here a very valuable point.
ThanksHi Armine
I think you are missing something here 🙂
Because of the constraints, the best solution has to be at one of the corners of the feasible area/region. The constraints do not change and to the values at the corners do not change.
The only reason we need the iso-contribution line is so that we can decide which of the corners is the best corner and therefore the optimal.
Whatever guess you make for the total contribution, the resulting line will be parallel and so it will still find us the best corner.
Once you have found the best corner, then the contribution line is no longer relevant – you simply calculate the values of S and E at the point where the two constraints cross (and remember – the constraints themselves do not change.)
I hope that helps 🙂
If anyone was wondering, the specific part about iso contribution starts around the 20th minute.
And within 10 seconds of it you`ll be able to understand every bit of it. Its so easy to understand when John explained it.
I never learnt it in college but I understood it here completely.This is a very old post but very useful.
Thanks John!
What we did at college was a trial and error. That we try at every constraint to get an answer.
It was pretty simple but this makes it even better
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