Rear brake line help

Okay thanks for the additional advice. I will replace that entire line. I already have maybe 3 or 4 feet of the copper/nickel tubing because that is what I used when I replaced the axle housing brake lines but it looks like I'll need more. Do I need to keep that flex hose that connected the brake line to the tee fitting or can I go directly to the tee fitting with the nickle/copper tubing? Thanks everyone