The text on the whiteboard appears to be a math problem. Can you transcribe the text and identify the subject and grade level?

Transcription:

• ТВ
• † 1
• A(3,1) и B(5,-1)
• а) через C(2,0) прямую
• a || AB
• Координаты точки n прямой
• обознач

Subject: Mathematics

Grade Level: Likely middle school or early high school (based on coordinate geometry and vector notation).