Linear function

A function whose graph is a straight line and whose rate of change is constant.

A relationship whose graph is a straight line and whose variables change at a constant rate.

A rule such as $y=mx+c$ whose graph is a straight line.

A function whose graph is a straight line and whose rate of change is constant.

A relationship whose graph is a straight line, usually written as $y=mx+c$.

A polynomial function whose highest power of $x$ is 1; its graph is a straight line.