1. Find the general solution of each differential equation using the substitution given.

x(d^2 y)/(d x^2) – 2 dy/dx + x = 0; dy/dx = v

2. Use the substitution v = y^-2 to find the general solution of the differential equation

dy/dx + y/x = x^2 y^3

Find also y in terms of x, given that y = 1 at x = 1.

Please help me to solve these.