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3x + y = 0 ---> y = -3x
Reemplazar y en y = 4 - x²
-3x = 4 - x²
x² - 3x - 4 = 0
(x-4)(x+1) = 0
x = 4, x = 1
2. p = √q
p = q² --> q² =√q
q² - q^(1/2) = 0
q^(1\2){q^4 - 1}
q^(1/2) = 0 , q^4 -1 = 0
q = 0 , q = 1