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Math Help - Multiple Variable Equation, T-89 Titanium

  1. #1
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    Multiple Variable Equation, T-89 Titanium

    What am I doing wrong?

    Problem: -mn-mr=s, solve for m

    My input: solve(-mn-mr=s, m)

    Output on calculator: 1=-s/mn+mr

    Real answer: m=-s/n+r

    Why isn't it displaying it the way I want it to?
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  2. #2
    Eater of Worlds
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    For goodness sake, you have to multiply the variables, otherwise, the calculator thinks it's one variable.

    Enter -m*n-m*r=s

    You can't just enter -mn. It has to be multiplied. The calculator is a dumb tool. It doesn't know that.
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  3. #3
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    Thanks so much. There's another problem I ran into.

    Problem: p=4rt-3rs, solve for r

    My input: solve(p=4*r*t-3*r*s,r)

    Output on calculator: r= -p/3s-4t

    Real answer: r= p/4t-3s

    I should be set for awhile after I'm helped with this one.
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  4. #4
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    Quote Originally Posted by riker View Post
    Thanks so much. There's another problem I ran into.

    Problem: p=4rt-3rs, solve for r

    My input: solve(p=4*r*t-3*r*s,r)

    Output on calculator: r= -p/3s-4t

    Real answer: r= p/4t-3s

    I should be set for awhile after I'm helped with this one.
    Both answers are the same: (factor out (-1))

    -\frac{p}{3s-t}=\frac{-p}{-(-3s+4t)} = \frac{p}{4t-3s}
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