Civics 101 tells us that the executive branch of federal or state government doesn’t write the laws. Rather, it upholds them and its executive departments in some cases may be charged with implementing the laws, including adoption of implementing regulations – that is, adding the missing precision needed to actually implement the law. Of course, regulations on how a law is to be implemented can’t actually change the law itself.Now, in some states like New Jersey, the Governor’s office has significant budgetary authority, including a line item veto option. Of course, that doesn’t however mean that the Governor’s office has the authority to actually rewrite the equations for school funding that were adopted by the legislature. 
...except that's just what Governor Christie's office is doing. Lots of good stuff here for the finance wonks among you!