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Algebra

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8s+ 12 = 16, 6s+ 9t = 12 solve by substitution

  • Algebra -

    I think you have a typo and you should have 12t in the first equation
    If so, then drwls made the following observation

    http://www.jiskha.com/display.cgi?id=1282324238

  • Algebra -

    8s+12=16............. equation 1
    6s+9t=12............. equation 2

    Multiply equation 1 by 3 and equation 2 by 4 and subtract.

    +24s+36= +48
    +24s+36t=+48
    - - - (sign will change when sub)
    .............
    36-36t=0
    t=1
    put t=1 in equation 2
    6s+9(1)=12
    s=1/2

    CHECK 6(1/2)+9(1)=12
    12=12
    LHS=RHS so your answer is correct

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