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-   -   Systems of Linear Equations: Matrices (https://www.askmehelpdesk.com/showthread.php?t=399430)

  • Sep 24, 2009, 07:40 AM
    PSU FAN
    Systems of Linear Equations: Matrices
    I am having trouble setting up the equations for this problem. I think that I am reading too much into it. Any help would be great. Thank you in advance.

    As a business owner there are many decisions that you need to make on a daily basis, such as ensuring you reach the highest production levels possible with your company’s products. Your company produces two models of bicycles: Model A and Model B. Model A takes 2 hours to assemble, where Model B takes 3 hours to assemble. Model A costs $25 to make per bike where Model B costs $30 to make per bike. If your company has a total of 34 hours and $350 available per day for these two models, how many of each model can be made in a day?

    * Solve the equations for the different bicycle models that can be made daily with the desired technique learned (graphing, substitution, elimination, matrix).

    * Explain how to check your solution for both equations.
  • Sep 24, 2009, 10:13 AM
    rehmanvohra

    I would suggest simultaneous equation:
    Let a be Model A
    Let b be Model B

    Equation for hours:
    2a + 3b = 34 ----------------- I

    Equation for costs
    25a + 30b = 350 ------------- II

    Multiply equation I by 10
    20a +30b = 340 --------------III
    25a + 30b = 350 --------------II

    Deducting II from III, we get
    -5a = -10
    or a = 2

    Substitute the value of a in equation I
    2 x 2 + 3b = 34
    3b = 34 - 4
    b = 10

    Check:

    Hours
    Model A 2 cycles x 2 hours = 4 hours
    Model B 10 cycles x 3 hours = 30 hours
    Total Hours 34

    Costs
    Model A 2 cycles x $25 = $50
    Model B 10 cycles x $30 = $300
    Total costs $350

    Q.E.D.
  • Sep 24, 2009, 03:10 PM
    PSU FAN

    rehmanvohra,
    Thank you for your help. I had the answers 4 & 10, but could not figure out the equations for the check. Thank you again.

    PSU FAN

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