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x=y+2
z=y-8
x+z=50
sustituimos x=y+2 , z=y-8 en la tecrea ecuacion
x+z=50
y+2+y-8=50
y+y+2-8=50
2y-6=50
2y=50+6
2y=56
y=56/2
y=28
si y=28
x=y+2......x=28+2......x=30
z=y-8......z=28-8........z=20
luisa tiene 30 años
carlota tiene 28 años
emilia tiene 20 años