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1) 5x + 2y = 1
2) - 3x + 3y = 5
Despejamos x en las dos ecuaciones
5x + 2y = 1 - 3x + 3y = 5
5x = 1 - 2y - 3x = 5 - 3y
x = (1 - 2y)/5 x = (5 - 3y)/-3
Igualamos las dos ecuaciones y multiplicamos en cruz.
(1 - 2y)/5 = (5 - 3y)/-3
- 3 (1 - 2y) = 5 (5 - 3y)
- 3 + 6y = 25 - 15y
6y + 15y = 25 + 3
21y = 28
y = 28/21
y = 4/3
El valor de y lo reemplazo en uno de los despejes de x
x = (1 - 2y)/5
x = (1 - 2 (4/3))/5
x = (- 8 + 3)/3/5
x = - 5/3/5/1
x = - 5/15
x = - 1/3
Respuesta-
x = - 1/3
y = 4/3