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?

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.

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.

Quote:

---

Originally Posted by riker

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))