a*0.5 + a*0.4*i - 0.4*b*i +10i=0, b*0.25 + b*0.15*i - a *0.75 - a*0.4*i = 0

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.