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D1 - Linear Programming query for test tomorrow - Help needed watch

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    For the linear programming problems where sketching is necessary, how should it be done. I know that sounds a stupid question but do you use pencil? Do you vaguely shade it in or fully?
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    (Original post by Burnsy91)
    For the linear programming problems where sketching is necessary, how should it be done. I know that sounds a stupid question but do you use pencil? Do you vaguely shade it in or fully?
    just write it as feasible region or shade it fully as appropriate , it really doesn't matter
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    (Original post by Burnsy91)
    For the linear programming problems where sketching is necessary, how should it be done. I know that sounds a stupid question but do you use pencil? Do you vaguely shade it in or fully?
    i think you're supposed to draw short lines on the side you're excluding from the feasible region
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    Yeah, short lines to show bits your excluding I believe, at least thats what we were told
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    hisome one plzz help me on this question about linear programming and by the way i am doing AQA D1

    Each day, a factory makes three types of hinge: basic, standard and luxury. The hinges produced need three different components: type A, type B and type C.
    Basic hinges need 2 components of type A, 3 components of type B and 1 component of type C.
    Standard hinges need 4 components of type A, 2 components of type B and 3 components of type C.
    Luxury hinges need 3 components of type A, 4 components of type B and 5 components of type C.
    Each day, there are 360 components of type A available, 270 of type B and 450 of type C.
    Each day, the factory must use at least 720 components in total.
    Each day, the factory must use at least 40% of the total components as type A.
    Each day, the factory makes x basic hinges, y standard hinges and z luxury hinges.
    In addition to x≥0 , y≥0 , z≥0 , find five inequalities, each involving x, y and z, which must be satisfied. Simplify each inequality where possible.

    Now i have been able to find three ineqaulities which are 2x+4y+3z≤360, 3x+2y+4z≤ 270, x+3y+5z≤ 450
    now i need help to find the other inequalities i checked the mark scheme they give these other ineqalities 6x+9y +12z ≥ 720
    ⇒2x+ 3y + 4z ≥ 240 (simplified), 2x+4y+3z≥ 2/5(6x+9y+12z)
    2y ≥ 2x + 9z

    i don't get how they have come up with the other inequalities so plzzzz help i have exam soon
 
 
 
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Updated: January 17, 2010

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