What is the answer for that question please help me

Which statement best explains whether the table represents a linear or nonlinear function? input (x) output (y) 2 5 4 10 6 15 8 20 it is a linear function because the input values are increasing. it is a nonlinear function because the output values are increasing. it is a linear function because there is a constant rate of change in both the input and output. it is a nonlinear function because there is a constant rate of change in both the input and output.

Subtract the following polynomials, then place the answer in the proper location on the grid. write answer in descending powers of x. 3x-5x+12 5x^2+x-11

Hello! could someone graph these as a linear system, ? y = 10x y = 5x + 30 thx!