I would like to solve this system of differential equations with Mathematica 7, but I found an error that says that the function was specified without dependence on all the independent variables.
The equations are:

Thanks everybody for your help
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I do not have V7 handy but does this help?