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:
`{(-7x,+,3y,+,47z,=,-28),(12x,-,12y,-,108z,=,48),(4x,-,3y,-,32z,=,16):}`
x =
y =
z =
`4+5z`
`-4z`
`z`