En una caja se tienen 12 tornillos de derecha , 18 tornillos de izquierda ,16 tuercas de izquierda y 14 tuercas de derecha ¿cuatos objetos se deben extraer al azar y como minimo para obtener con seguridad un juego (tornillo y tuerca utilizable)?

What the f u c k tou are talking

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.

What is your question again i don't understand