\starttext
\startformula
  \startmathalignment[m=2,distance=4em]
   \NC \text{slope}_A \NC = 0
   \NC \text{slope}_B \NC = \frac{1}{2} \NR
  \stopmathalignment
\stopformula
\stoptext

In ConTeXt 2017.05.15 (shipped with TexLive 2017), the second column is 
formatted as text rather than math. The result gives 'slope_B' rather than 
placing B as a subscript.

Online and with 2016.05.17 (shipped with TexLive 2016), the second column is 
formatted correctly as math.
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