salmonporpoise996

Let y = f(x) be the solution to the differential equation dy/dx = x - y with initial condition f(1) = 3. What is the approximation for f(2) obtained by using Euler's method with two steps of equal length starting at x = 1? (A) -5/4 (B) 1 (C) 7/4 (D) 2 (E) 21/4