urban life

Li Wei's face was green, and he stared at Qin Luo straightly: "Qin Luo, get up, tell me how to solve this problem?"
While talking, Li Wei casually wrote a mathematical equation on the blackboard.
He even dared to sleep in his class. He simply didn't know how to write dead words.
"It is known that the ellipse X-square+Y-square=1 and the straight line X-Y+B=0 intersect at two points PQ, and O is the origin of the coordinate. If OP is perpendicular to OQ, find the value of B and write the process."
Qin Luo Juhua's face was stunned.
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