The word linear means in a straight line. If the graph is a line, it is linear. Also, linear equations are of the first order; they contain a variable but not a square (or higher power) of a variable. If the equation contains x2 it is not linear.
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A linear function is a function whose graph is a straight line.
A linear function would be represented by a straight line graph, so if it's not a straight line, it's nonlinear
the graph is called a line
A linear function
a) A circle is not the graph of a function. b) A circle is not linear.