17. Express the curve x(t) = 2et, y(t) = eat - 4 by an equation in terms of r and y: A. r = 27'-4,y>0 B. y = 2r' -4, r>0 C. 1= -4,830 (@-4)3 D. V= 8 E. //= 8 F. none of the above 18. Find a parametrization 2 = (t), y = =(t), fe [0, 1] for the line segment through (2, 6) and (6,3). A. r(t) = 2 - 4t, y(t) = 6 +3t B. r(t) = 2 + 4t, y(t) = 6+ 3t C. x(t) = 2 -4t, y(t) =6 -3t D. r(t) = 2 + 4t, y(t) =6 -3t E. x(t) = 6-3t, y(t) = 2+ 4t F. none of the above