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2x+3y = 13
7x-27 = 8 , ojo : aqui debe ser 27 y no 24 como dice el libro
de aqui debemos resolver las ecuaciones que seria:
7x-27 = 8 -------> 7x=27+8 =35 -----> x = 5
reemplazamos y calculamos el otro valor :
2(5)+3y = 13
10+3y = 13
3y = 13-10
3y = 3 ------> y = 1
piden x-y = 5-1 = 4 <---- respuesta