Is y= x/2 linear or nonlinear

Which function has the same domain as y=2x

In two or more complete sentences, formulate how to use technology to calculate the appropriate regression model for the given data. you are not required to find the model, just choose the appropriate regression and explain how to use the technology. (-5,,2.,0.8), (0,-0.5), (2,-1.3), (3,-0.8), (5,2)

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function