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Math Help - [SOLVED] (word problem) The price of a stock is linear with respect to time

  1. #1
    SaltyDawg
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    [SOLVED] (word problem) The price of a stock is linear with respect to time

    Hello all,

    I'm stuck with a problem here and don't really know where to start.

    The price of a stock is linear with respect to time. If its price on Day 1 is 131 and its price on Day 3 is 135, what will its price be on Day 10?

    If anyone can show me the formula and method of how to solve this I would appreciate it.

    Thnkx
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  2. #2
    Senior Member
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    If the price is linear then on day x the price y is given by a formula y=mx+c where m and c are constants to be determined. You know that when x = 1, y=131 and when x=3, y=135. Substituting, 131=m+c and 135=3m+c. This is enough information to tell you m and c.
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