How solve

[yingwuluo]

solve([1-x*e^(?50*y)=100/z,1-x*e^(?100*y)=200/z,1-x*e^(?150*y)=250/z],[x,y,z])
[/b]
["[y,e^(-50*y),e^(-100*y),e^(-150*y)] is not rational w.r.t. y Erreur: Valeur Argument Incorrecte"]

fsolve([(1-x*e^(-50*y)) = (100/z),(1-x*e^(-100*y)) = (200/z),(1-x*e^(-150*y)) = (250/z)],[x,y,z],[-0.1,-0.1,-0.1*i])

undef

Above output is the result from HP Prime Graphing Calculator, something wrong with it, please help me check if there is any input mistake.