HELP ASAP TELL ME IF THIS IS CORRECT OR NOT

Answer:
yes, no, yes, no
Step-by-step explanation:
the first two are correct, try an example for 2 and 3
b = a - 5 yes
if a = 5 and b = 0
5 - 5 = 0
a = b - 5 no
if a = 5 and b = 0
5 = 0 - 5 which is not true 5 doesnt equal -5