In its simplest form the domain is all the values that go into a function, and a range is all the values that come out.
Answer with explanation:
The given expression is

→As, multiplication of real number follows Commutative property.
Which states that, if a and b are any two real numbers , then
a × b= b × a
The Expression equivalent to ,the above expression are

yes all proportional relationships are all linear relationships
non-proportional=non-linear