title: from a function, how do i get a return value in Lua
body: <p>How do I do below in Lua please?
  I would like to get my variable returned to use it on another computation.</p>
  
  <pre><code>def xy(x, y):
    z = x * y
    return z
  
  z = xy(2, 5)
  z2 = z * 7
  print (z2)
  </code></pre>