Step-by-step explanation:
a power supply, a load suited to the power supply, and wiring as a conductor
-2; 3-5= -2 or -5 - (-3)
-1; 4-5 or -5 - (-4) = -1
-5; -6 - (-1)= 1-6= -5
Independent variable (IV): something the scientist can change.
Thus, in this case, the IV can be the weight of the person.