45. let r = (s), y = y(s), u = u(s), s e r, be the z-o du -u = 0, le chor pldse characteristic curve of the pde ax passing through a given curve x = 0, y = t, u

45. Let r = (s), y = y(s), u = u(s), s e R, be the z-O du -u = 0, Le chor Pldse characteristic curve of the PDE ax passing through a given curve X = 0, y = T, u = T, t e R Then the characteristics are given by X= 3t (e- 1), y = -(e+1); u = te2 2 A B. x = 2t(e-s - 1), y = t(2e25 1), (1+e2 2 U = ex = 2t(e - 1), y = (e+1). u = ttezs 2 D. x = T(es - 1), y = -2T 3 u = TP(2e-2s 1) 6. Let flx