1. Let f(:r,y) = 237953109) + 1). |f(1=0) 320:0) : fy(1a0)= (b) (1 Point) Find the nearization of f at (1,0). (c) (1 Point) Use your answer to part (b) to estimate f when :1: = 0.9 and y = 0.2. | f(0.9,0.2) 5