Solve y′=2/yy' = 2/yy′=2/y.
y2=4x+Cy^2 = 4x + Cy2=4x+C
y=2x+Cy = 2x + Cy=2x+C
y=ln(x)+Cy = \ln(x) + Cy=ln(x)+C
y2=2xy^2 = 2xy2=2x