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elric
Lv 4
elric asked in Science & MathematicsEngineering · 1 decade ago

how can i solve this arithmetic problem?

if the 8th term is 23 and the 12th term is -1, what is the first term?

Update:

thanks cool!! i already knew the answer but i didn't know how to get it the answer

2 Answers

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  • Cool
    1 decade ago
    Favorite Answer

    8x + c = 23 --- (1)

    12x + c = -1 --- (2)

    subtract (1) from (2)

    12x + c = -1

    - ( 8 x + c = 23)

    --------------------------

    4x = -24 ==> x = -6

    Now

    8x + c = 23

    also x = -6

    so c= 23+48 = 71

    1st term is x+c = -6 + 71 = 65 (Answer)

  • vatsa
    1 decade ago

    data insufficient..

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