Answer:
it cannot be the third one
Step-by-step explanation:
the reason why is because if you multiply anything by 0 its 0. and 0 is not a positive or negative.
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Answer:
The first one
Step-by-step explanation:
In mathematics, the term linear function refers to two distinct but related notions: In calculus and related areas, a linear function is a function whose graph is a straight line, that is, a polynomial function of degree zero or one. So going in that order gives you a linear function.

From there we can see that because x equals both to a and b, it must be that a = b.