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Metodo de sustitucion.
x = 3y (1)
x² - y² = 1800 (2) Sustituimos el valor de (1) en (2)
(3y)² - y² = 1800
3²y² - y² = 1800
9y² -y ² = 1800
8y² = 1800
y² = 1800/8
y² = 225
y = √225 Tiene 2 soluciones reales
y = 15 Porque 15 * 15 = 225
o
y = - √225
y = - 15 Porque (- 15)( - 15 ) = 225
Para y = 15
x = 3y
x = 45
Solucion
(45 , 15)
Para y = - 15
x =3y
x = 3( - 15)
x = - 45
Solucion.
( - 15 , - 45)