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decena = y
el numero = 10y +x
PLANTEAMIENTO DE LAS ECUACIONES
(1) x+y = 9---------------------despejando x = 9 -y
(2) (10y +x)/y = 12
(10y +x)/y = 12
(10y +x)= 12y; sustituyendo x
10y +(9 -y)= 12y
10y -12y-y = -9
-3y = -9
y = -9/-3
y = 3
x = 9 -y = 9-3
x = 6
RESPUESTA
unidad = x = 6
decena = y = 3
el numero = 10y +x = (10*3)+6 = 30+6 = 36