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.
PLOT y=x+2y-7; y = x+2y+7 , x=0 , y=0
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random