直交 ちょっこう座標 ざひょうではありませんでした
cho' kōzahyōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 直交座標

1. Was not orthogonal coordinates.; Was not a Cartesian coordinate system.

Past/Perfective
Negative
Polite
Formal Register