Which property of equality justifies the following sequence of statements?

if 3x+2y=72

and 2y=3z ,

then 3x+3z=72

a. addition property
b. subtraction property
c. multiplication property
d. division property
e. none of the above

e. None of the above

Step-by-step explanation:

If

and

then     [By Substitution property]

is being substituted by

Since substitution property is not there in the choices, therefore 'none of the above' is correct.

nope.   happens to me as well.

-aparri