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Math Help - algebraic methods; please help me!

  1. #1
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    algebraic methods; please help me!

    Here is my problem, I do not understand it at all!

    Find a and b so that (-2, -1) is the unique solution to the system below.

    ax+by= -7
    -ax+ 2by = -2
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by runner940 View Post
    Here is my problem, I do not understand it at all!

    Find a and b so that (-2, -1) is the unique solution to the system below.

    ax+by= -7
    -ax+ 2by = -2
    Substitute the x and y from the given point into your system and solve the new system for a and b.
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