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March 25, 2017

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if a3= 17 & a8=37 are terms in annarithmetic sequece, fina a1 & d. the answer is a1=9 & d=4 but i don't understand how they got the answer, please help!

  • alg2\trig - ,

    term(3) = a + 2d (by definition)
    = 17
    term(8) = a + 7d = 37

    a+7d = 37
    a+2d = 17
    subtract them
    5d = 20
    d = 4
    sub into a + 2d=17
    a + 8 = 17
    d = 9

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