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| Question 1148528:  angle 1 supp. angle 2.
 angle 3 supp. angle 4.
 angle 5 supp. angle 6.
 angle 2 is congruent to angle 4
 angle 1 = 3x
 angle 2 =6y
 angle 3 =  2x+10
 angle 4 = 40+z
 angle 5= x+ y+z
 Find angle 6.
 
 Answer by CubeyThePenguin(3113)
      (Show Source): 
You can put this solution on YOUR website! 3x + 6y = 180 2x + 10 + 40 + z = 180
 x + y + z + (angle 6) = 180
 6y = 40 + z
 
 The first, second, and fourth equations are usable.
 
 x + 2y = 60
 2x + z = 130
 6y - z = 40
 
 Solving, we get (x, y, z) = (10, 25, 110).
 
 Now we can substitute into the third equation:
 
 10 + 25 + 110 + (angle 6) = 180
 
 angle 6 = 35 degrees
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