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    sagetbob55's Avatar
    sagetbob55 Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Nov 25, 2007, 07:02 PM
    Inverse Matrix solve the system
    Could someone help with my hw? :( use this inverse to solve the system.

    7x-8y=-21
    x-y=-2
    eaca1234's Avatar
    eaca1234 Posts: 40, Reputation: 2
    Junior Member
    		  
    #2

    Nov 29, 2007, 09:54 PM
    First, you have to plug the coefficients (the left side) into a 2x2 matrix.
    matrix A= [7 -8]
    [1 -1]
    Then, plug in the answers (the right side) to a 2x1 matrix.
    Matrix B= [-21]
    [ -2]
    Multiply the inverse of Matrix A by the original form of Matrix B.

    The solutions of the multiplication will be your x and y, in that order.
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