Select linear or nonlinear to correctly classify each function. Function linear nonlinear y=2x−9 linear – y=2x−9 nonlinear – y=2x−9 y=−10. 2 linear – y=−10. 2 nonlinear – y=−10. 2 y=3x2+7 linear – y=3 x 2 +7 nonlinear – y=3 x 2 +7 3x + 5y = 15 linear – 3x + 5y = 15 nonlinear – 3x + 5y = 15.