Problem to solve

I came across this problem when I was 16 and I have never been able to solve it. I´ve asked friends and family throughout the years but no one have come up with a solution.



These are the rules
Draw a rectangel as shown in Fig. 1 then proceed with drawing a line (red in Fig. 2) that shall cross every line in the rectangel once and only once. As shown in Fig. 2 I always get one line in the rectangel left (see the green X) in order to not get one line left I have to cross a line in the rectangel twice and thats not allowed.

If you find a solution to this please email me at solution@pirum.nu