Solve the differential equations. Questions 3 - 4 are separable. Questions 5 - 7 are linear. 3) dy dx =9x8y dy X 4) dx 10y dy 5) + 5V = e-5x dx 6) 2x dy -+ y = 5x4 dx Solve the differential equation subject to the initial conditions. 7) y'+ y= 2ex; y = 7 when x = 0