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Math Help - Finding an equation of an Exponential Function from a Graph

  1. #1
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    Finding an equation of an Exponential Function from a Graph

    Hello, there's a graph in my textbook. that appears to start at (0,0) and the only given point is (1,2) and there is a horizontal asymptote at y = 4.

    The question asks to give a possible formula for the function.

    The equation is increasing from left to right, but it concaves down from (0,0) to oo.

    My question is, how am I supposed to find a formula from the given information? thank you
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  2. #2
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    try this one ...

    y = 4(1 - 2^{-x})
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  3. #3
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    I think the answer is -(2)^-(x-2)+4 but i just can't seem to prove how i got it. I just don't understand how I'm supposed to find an equation based solely on a graph
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