Is this graph a linear or nonlinear function?

Is this graph a linear or nonlinear function?

Is this graph a linear or nonlinear function?

Is this graph a linear or nonlinear function?

What is the slope of this line?

What is the slope of this line?

What is the slope of this line?

What is the slope of this line?

What is the slope of this line?

What is the initial value (y-intercept)?

What is the initial value (y-intercept)?

What is the initial value (y-intercept)?

What is the initial value (y-intercept)?

What is the initial value (y-intercept)?
