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I have an equation array consisting of around 9 equations, however I wish to number only some of them. How can I do that?

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You can use \nonumber before the \\. – azetina Oct 17 '12 at 13:54
See: tex.stackexchange.com/a/75768/10898 – azetina Oct 17 '12 at 13:55

You can use \notag and/or \nonumber from amsmath (or improvised mathtools package):


  x &= y \\\nonumber
  x &= 3 \\
  y &= 10 \\ \notag
 \therefore\ x &\neq y \\
   x &= y \\\nonumber
  x &= 3 \\
  y &= 10 \\ \notag
 \therefore\ x &\neq y \\
 ? &=?

enter image description here

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