Ejercicio 1
\[x^2 - 5y = 51 \atop -3x + 3y = -33\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
Ejercicio 2
\[x^2 + 5y = 19 \atop -4x + 5y = 22\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
Ejercicio 3
\[x^2 + 5y = 65 \atop -5x + 5y = 15\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
Ejercicio 4
\[x^2 + 2y^2 = 66 \atop -x + 2y = 6\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
Ejercicio 5
\[x^2 - y^2 = -9 \atop -x + 3y = 11\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
Ejercicio 6
\[x^2 - y^2 = 12 \atop -3x + y = 14\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]