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.
49a - 7b + c = -9,9a + 3b + c = 4, 64a + 8b + c = 9
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random