Why will the water not drain out to the line in the yard? Instead, the water from the washer fills up the toilet. On a regular flush, the toilet water comes to the top. Lines have been snaked, even the vent on the roof, but did find out the main line under the house from the toilet to the backyard pipe is leaking water. Pipe is the original installed about 60 years ago. Any advice?

You have sewer blockage somewhere between the toilet and outside . Remove toilet and snake sewer pipe from closet ring. That should do...