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x+4 = 4m ec. 2
si multiplicamos por -2 la ec. 2 y la sumamos a la ec. 1:
x -4 = 8m
-2x-8 = -8m
x -12 = 0
x = 12
La edad de Ximena es de 12 años
de la ec. 2:
x+4 = 4m
12+4 = 4m
16 = 4m
m = 16/4
m = 4
La edad de Matías es de 4 años
Saludos..