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Hi John,
I am struggling (im a bit slow so apologies) with how the answer is explained on this question. I have watched your lectures and understand them but on this question there are three items on the cost card whereas on yours its normally just the two (materials and labour). My confusion is how to get to the point in this question where you are multiplying one by 2.5 to cancel out the other like in your lecture with there being 3 variables? do you have an old podcast of the exam answers for this paper maybe?
Any help would be great, would just also like to say I find your sessions really inspirational, they help me and thousands of others out there a hell of a lot!!
It does not matter how many constraints there are (in the example that I go through in the lecture there are four constraints).
The optimal mix is always where two of the constraint lines cross (i.e. at one corner of the feasible region) and therefore you are only ever solving 2 equations with only 2 variables.
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