Structural model in NONMEM!

Dear all! I have a question about structural model in NONMEM! Can NONMEM deal with linear structural model like y=a+b*x? If it will do, how the code should be prepared? Thanks in advance! Fang ke ___________________________________________________________ 好玩贺卡等你发，邮箱贺卡全新上线！ http://card.mail.cn.yahoo.com/