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X ×Y = 144 (2)
De (1) despejas cualquiera
Despejo X
X = 25-Y
Reemplazas en (2)
X× Y = 144
(25 - Y) ×Y = 144
- Y² + 25 Y = 144 //×(-1)
Y² - 25Y = - 144
Y² - 25Y + 144=0
(y - 16) (y - 9)= 0
Y = 16 o Y = 9
Reemplazas en X = 25-Y
X = 25-16
X = 9
..
X = 25- 9
X = 16
XD
La respuesta es
16 y 9
16+9= 25
16*9= 144