X = Primer Numero
Y = Segundo Numero
X + 5(1 / Y) = 2 ; X + (5 / Y) = 2 (1)
Y + 4X = 9 (2)
Y = 9 - 4X ; Reemplazo Y en (1)
X + [5 / (9 - 4X)] = 2
[X(9 - 4X) + 5] / (9 - 4X) = 2
[9X - 4X² + 5] = (9 - 4X).
2
[9X - 4X² + 5] = 18 - 8X
0 = 4X² - 9X - 8X + 18 - 5.
0 = 4X² - 17X + 13
a = 4 ; b = - 17 ; c = 13.
<img src="https://tex.z-dn.net/?f=X%3D%5Cfrac%7B-b%5Cpm%20%5Csqrt%7Bb%5E2-4ac%7D%7D%7B2a%7D" />
<img src="https://tex.z-dn.net/?f=X%3D%5Cfrac%7B-%28-17%29%5Cpm%20%5Csqrt%7B%28-17%29%5E2-4%284%29%2813%29%7D%7D%7B2%284%29%7D" />
<img src="https://tex.z-dn.net/?f=X%3D%5Cfrac%7B17%5Cpm%20%5Csqrt%7B289-208%7D%7D%7B8%7D" />
<img src="https://tex.z-dn.net/?f=X%3D%5Cfrac%7B17%5Cpm%20%5Csqrt%7B81%7D%7D%7B8%7D" />
X = [17 + / - 9] / 8
X1 = [17 + 9] / 8 = 3.
25
X2 = [17 - 9] / 8 = 1.
Usamos X = 1
Y = 9 - 4X ; Y = 9 - 4(1) = 5
Y = 5.
Los numeros son 1 y 5.