What does linear functions mean?

Answer 1

On a graph it is a STRAIGHT line.

A Curved line on a graphy is NOT a linear function.

e.g.

y = x is a linear function

y = x^(2) is NOT a linear function.

Answer 2

A linear function is a function in which only the first power of the variables appears.

A linear function is in the form of y=ax+b. When graphed, the graph is a straight line.

'a' is the slope of the line, 'b' is the value of 'y' where the line crosses the y-axis.

For example: y=2x+4 is a linear function