Which graph is linear?

Is this graph linear or nonlinear?

Is the graph pictured a linear or nonlinear function?

Is this function linear or nonlinear?

Is this function linear or nonlinear?

$$y=\frac{x}{3}+4$$  

Is this function linear or nonlinear?

$$y=x^2+3x\ +4$$  

Is this function linear or nonlinear?

$$xy=7$$  

Is this relation linear or nonlinear?

$$x=-7$$  

Is this a linear function?

$$x=-7$$  

Is this function linear or nonlinear?

$$y=x$$  

Is this function linear or nonlinear?

Why is this function linear?

Is this function linear?

Is this linear or nonlinear?

Is this function linear or nonlinear?

Which equation represents y as a linear function of x?

Is this function linear or nonlinear?

Which show a linear function? Select 2.

Which of these functions are linear?

Select two answers.