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Veamos:
Para P(2,1):
• x+y=2
• 2x-y=1
Sumando ambas ecuaciones:
3x = 3
x=1 , entonces: y=2-1=1
Si x=1,y=1, entonces:
P(2,1)=1²+1² = 2
Saludos! Jeizon1L ;)