Question

Which property of equality would be used to isolate the variable a in this equation?
a-4=12

Answer 1

if we perform the same function on the sides of an equality it will persist
that is if we have x=y, we can always say that f(x)=f(y), so if we perform the function f(x)=x+4 on both sides we get =>
f(a-4)=f(12)
a-4+4=12+4
a=16