In the x-y plane, the y-axis contains all ordered pairs such that

How are we suppose to know this

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The answer is "gesture and body language mostly  your verbal interaction".


gesture and boy language refers to a form of non-verbal communication, in which obvious substantial activities impart specific messages, either set up of, or in conjunction with, discourse. gestures incorporate development of the hands, confront, or different parts of the body. body language is physical conduct, instead of words, are utilized to express or pass on data. such conduct incorporates outward appearances, body act, signals, eye development, touch and the utilization of room.