Try another version of this question Solve the system of equations. If the system has an infinite number of solutions, express them in terms of the parameter z. Get help:
`{(-2x,+,5y,+,19z,=,22),(3x,-,11y,-,39z,=,-47),(-x,+,5y,+,17z,=,21):}`
x =
y =
z =
`-1+2z`
`4-3z`
`z`