Interpret Linear Function Equations Practice Test

$y=2x$ and $y=x^2$ are both linear because both graphs pass through $(0,0)$.

$y=2x$ is non-linear because it has no $b$ term; $y=x^2$ is linear because it has a constant rate of change.

$y=2x$ is linear because $x$ is to the first power; $y=x^2$ is non-linear because $x$ is squared.

$y=2x$ is non-linear because it has a variable; $y=x^2$ is linear because it has an $x$.