It is possible to use your spouse's income, as his unauthorized employment will be excused upon the filing of the I-485.
But there are a few that might pose problems:
1) The employer would have to say that s/he is willing to continue your spouse's employment, meaning s/he would have to pay at least the federal or state minimum wage, whichever is higher; and
2) Considering even your spouse's income, the total income for the household ($24,169) still does not rise to the minimum requirements for a family of three, which is $24,413.
The solution in this case would be to include assets, like a home you own, savings, investments, and/or having a joint sponsor for the I-864. Note that the joint sponsor has the same responsibilities to the US government that you do, when submitting the I-864.
I hope I have answered your questions. Please reserve your rating for the very end of our conversation. If at that time you're satisfied with my answer and my professionalism - not the outcome or the state of the law which I cannot control - please select a top-three rating. The bottom two negative ratings are reserved for pros who are rude and/or bad at their job, and I'm confident you'll find me to always be professional and truthful with you.
A bonus is appreciated, if you feel I've earned it.
If you want me to answer questions in the future, you can write "FOR LONGHORN" at the beginning of your question, or go directly to my question page here: Ask Longhorn Lawyer