Final answer:
To eliminate the parameter and find a Cartesian equation, solve for t in terms of x and substitute into the equation for y, resulting in y = x^(-3).
Step-by-step explanation:
To eliminate the parameter and find a Cartesian equation of the curve defined by x = e^t and y = e^(-3t), we need to solve for t in one equation and substitute into the other.
We can write t as t = ln(x) since x = e^t.
Then, substituting this into the equation for y gives us y = e^(-3*ln(x)).
Simplifying this, we use the property of exponents that e^(ln(a)) = a to get y = x^(-3), which is our Cartesian equation.