Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
solve a*c=m, a*d=n, c*b=p, b*d=q for a, b, c, d
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random