Match the following differential equations with their solutions. The symbols A, B, C in the solutions stand for arbitrary constants. You must get all of the answers correct to receive credit.
1. dx2d2y+4y=0
2. dxdy=−2xyx2−2y2
3. dx2d2y+14dxdy+49y=0
4. dxdy=4xy
5. dxdy+21x2y=21x2