Question 648279
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Hi,
Two angles are complementary.  x + y = 90
The measure of one angle{{{highlight(y)}}} is 21 more than twice the measure of the other angle{{{highlight(x)}}}.
Question states***
x + y = 90°    ||{{{y = 2x+21}}} substituting for y..
x + (2x+21) = 90° 
  3x = 69°   
   x = 23° and y = 67°   ||{{{y = 2*23 +21 = 46 + 21 = 67}}} 
and..
23° + 67° = 90°