Help with this please i dont understand?

The angle is 90°

Supplement of angle = 90°

Complement of angle = 0°

Step-by-step explanation:

Let the angle be y

Supplement of angle = 180 - y

Complement of angle = 90 - y

Since measure of angle equals sum of it's complement and it's supplement, therefore;

180 - y + 90 - y = y

270 - 2y = y

270 = 3y

y = 270/3

y = 90°

Therefore the angle is 90°

Supplement of angle = 180 - 90 = 90°

Complement of angle = 90 - 90 = 0°