Answer:
e. None of the above
Step-by-step explanation:
If [tex]3x+2y=72\\[/tex]
and [tex]2y=3z[/tex]
then [tex]3x+3z=72[/tex] [By Substitution property]
[tex]2y[/tex] is being substituted by [tex]3z[/tex]
Since substitution property is not there in the choices, therefore 'none of the above' is correct.