Answer:
It is a linear function because
A linear relationship (or linear association) is term used to describe a straight-line between two variables. Linear relationships can be expressed either in a graphical format or as a mathematical equation of the form y = mx + b.
It is a linear function, because the line has no curve, and the line is constant
Explanation:
In a non linear function there would be a curve in the line, in this line there is no curve so therefore it is linear function.
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