Particle Strangeness: Prove Sigma Hyperon has S=-1

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Homework Statement



The [tex]\Sigma[/tex] hyperon exists in three charge states (+1,0,-1 in electron charge units) Show that it has strangeness S = -1.

Homework Equations





The Attempt at a Solution



I'm not too sure how to approach this question. I've been studying SU(3) quark diagrams where the Sigma's all lie on the S=-1 plane, but I don't think that's what the question is asking. Can anybody offer any insight?
 

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The three charge states tell you something about the 3-component of the isospin. You also know that the sigma is a baryon, so you know its baryon number. Have you been taught a relation between [itex]I_3[/itex], [itex]B[/itex], [itex]Q[/itex], and [itex]S[/itex]? (Hint: Look up Gell-Mann/Nishijima relation)