supplement means the sum of the two angles is 180° → y = 180 - x
complement means the sum of the two angles is 90° → y = 90 - x
supplement - 3(complement) = 46
(180 - x) - 3(90 - x) = 46
(180 - x) - 270 + 3x = 46
2x - 90 = 46
2x = 136
x = 68
Answer: 68°