Question

sendo xy = 13^-1 , calcule o valor de x+y na expressao x^2y + xy^2 = 39 essse sinal ^ significa elevado

Answer 1

$xy=13^{-1} \\ \\ x^2y+xy^2=39 \\ \\ xy(x+y)=39 \\ \\ x+y= \frac{39}{xy} \\ \\ x+y= \frac{39}{ \frac{1}{13}} \\ \\ x+y=39*13 \\ \\ x+y=507$