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Thread: How do I solve for y?

  1. #1
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    How do I solve for y?

    Please help me with this problem. I have to rewrite it as y=????




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  2. #2
    Forum Admin topsquark's Avatar
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    Re: How do I solve for y?

    Quote Originally Posted by Ema453 View Post
    Please help me with this problem. I have to rewrite it as y=????




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    $\displaystyle x = 7^{y + 1}$

    Take the $\displaystyle log_7$ of both sides:
    $\displaystyle log_7 (x) = log_7 \left ( 7^{y + 1} \right ) = y + 1$

    Can you finish from here?

    -Dan
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  3. #3
    Member Walagaster's Avatar
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    Re: How do I solve for y?

    Or, if you need a decimal answer and your calculator doesn't do $\log_7$, just take the natural log of both sides in the first place.
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  4. #4
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    Re: How do I solve for y?

    TATTOO this on your wrist (under your watch!) : "if a^x = b, then x = log(b)/log(a)"
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