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x+10=2(y+10)
x-5=3(y-5).......x-5=3y-15.......x=3y-15+5.........x=3y-10
sustituimos x=3y-10 en la primera ecuacion.
x+10=2(y+10)
3y-10+10=2y+20
3y=2y+20
3y-2y=20
y=20
si y=20
x=3y-10
x=3(20)-10
x=60-10
x=50
juan tiene 50 años y ana tiene 20 años