Resumen
Ejercicio 1
\[-5x - 3y = 7x \atop 2x + 2y = -2x\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
Ejercicio 2
\[-4x + 2y = 16x \atop x - 2y = 8x\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
Ejercicio 3
\[x^2 - y = -5 \atop -5x - 5y = -35\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
Ejercicio 4
\[x^2 + 2y^2 = 19 \atop 2x + 2y = -8\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]
\[x = \boxed{\phantom{\rule{2em}{1.2em}}}, y = \boxed{\phantom{\rule{2em}{1.2em}}}\]