Why can the lorentz transformation: https://upload.wikimedia.org/math/e/3/e/e3ee37f49f0adb02bc81590cb697d4d0.png
Also be expressed as https://upload.wikimedia.org/math/0/d/6/0d6f3185dd8047b094a17478eed58b22.png
?
I understand that ct is time and space understood as length (example meters) but how do I read that from this transformation change?