Question

find a parametrization for the left half of the parabola y=x^2-4x+3 ?

Answer 1

hen you substitute your x(t) function for into;

y(x(t)) = x(t)^2 - 4x(t) + 3

but since x(t) = t, then

y(t) = t^2 - 4t +3

Hope that makes sense,
W.O.M.B.A.T.

Answer 2

You copied that from yahoo. I don't understand why they did what they did in that solution.