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linear programming graph

Forums › Ask ACCA Tutor Forums › Ask the Tutor ACCA PM Exams › linear programming graph

  • This topic has 3 replies, 2 voices, and was last updated 7 months ago by John Moffat.
Viewing 4 posts - 1 through 4 (of 4 total)
  • Author
    Posts
  • November 12, 2021 at 7:20 pm #640505
    syedwaris
    • Topics: 17
    • Replies: 9
    • ☆

    I have a little thing to ask you that when you plot a graph in linear programming how do you know what scales (or measures) to choose on x-axis and y-axis?

    I watched your lecture but was unable to understand this. And I know that drawing the graph will not be asked in the exam

    November 13, 2021 at 4:22 pm #640563
    John Moffat
    Keymaster
    • Topics: 57
    • Replies: 49603
    • ☆☆☆☆☆

    You choose scales such that it will be possible to draw all of the relevant lines (and I do explain this in my lecture).

    However, it is irrelevant for the exam since you will never be expected to draw the graph.

    November 14, 2021 at 8:16 am #640600
    syedwaris
    • Topics: 17
    • Replies: 9
    • ☆

    BUT how should we actually choose scales to draw all the lines?

    According to the example of the notes then we should choose the scale in two ways:

    1) Use scales after finding the values for S and E such as in materials S value is 40 while E value is 20. So we should choose a scale up to 40 which is the highest value. (correct?)

    OR

    2) We can use the average of total available resources such as 80 kg of material is available so choosing the scale would be on average of total available resource (80 kg / 2) = 40 which will be the highest scale.

    (Both ways are correct?)

    I know that we’ll not be asked to draw in the exam but I am learning to draw myself and I am stuck plotting the scales.

    Thanks for your previous answer 🙂

    November 15, 2021 at 7:32 am #640655
    John Moffat
    Keymaster
    • Topics: 57
    • Replies: 49603
    • ☆☆☆☆☆

    You just need to make sure that the scales go far enough so as to be able to draw all of the lines. So for each constraint put 0 for one of the variables and calculate the value of the other variable, then repeat it putting 0 for the other variable.

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