What is Roy's identity?

this is under microeconomics.. i hoep someone can answer this. thanks

Answer:
δU* = δ£ = - λMxiM
δpi = δpi

I can't get the subscripts, superscripts, and fractions to come out right, but the first two portions are fractions (I had to put equal signs on the top and the bottom to make it line up right). All the i's are subscripts. The M's are superscripts, and the £ is a fancy L from the lagrangian.
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