The same slope would make the equations parallel. Therefore 5/3 would make them parallel.
Answer and Step-by-step explanation:

Decreased by 20%
Answer:
2 5/6
Step-by-step explanation:
WE CHANGE 3 1/2 INTO IMPROPER FRACTION WHICH IS 7/2
7/2-2/3=2 5/6
Step-by-step explanation:
interest:

Total=500+30=530