Steel Design I Am Having Trouble With The Concepts Of Elastic Plastic Neutral Ax

Steel Design
I am having trouble with the concepts of elastic/plastic neutral axes. What determines which axis you take the modulus about? How do you find the plastic neutral axis of a non-symmetrical shape?
Determine the elastic neutral axis, elastic section modulus, plastic neutral axis, and plastic section modulus for a WT15x45 modeled as two rectangles forming the flange and the stem.
 
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