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x=3y
x²-y²=1800
sustituimos x=3y,en la segunda ecuacion
x²-y²=1800
(3y)²-y²=1800
9y²-y²=1800
8y²=1800 dividimos todo entre 8
y²=225
√y²=√225
y=15 y= -15
si y=15.....x=3y,,,,.....x=3(15)......x=45
si y=-15....x=3(y)........x=3(-15)....x=-45
soluciones
x=45 y=15
x=-45 y=-15
si trabajas solo con numeros naturales,
la respuesta es: 45 y 15