Q.my tomato plants are drying out and dying starting at the bottom, the leaves look rusty
the plants are both determinate and indeterminate, they have blooms but only one has any tomatoes

Certified GKH Gardening Expert
Have you been feeding the tomato with anything? This sounds a bit like nitrogen toxicity, but it can be hard to say for certain without seeing the damage. I would offset this with a high phosphorus and potassium feed. This will counter the nitrogen, as well as provide what the plant needs to bloom.
This article will help you to grow tomato plants successfully: https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-tomatoes-guide.htm
In addition, we have a new ebook on growing tomatoes you might be interested in. Here is the link for more information and a free download:
https://blog.gardeningknowhow.com/ebooks/essential-guide-to-growing-tomatoes/