eliminate the parameter to find the cartesian equation of the curve for x=√t, y=7-t for x≥ 0
Substitute the value of t from the first equation into the second equation:
t = x^2
y = 7 - t
y = 7 - x^2
The Cartesian equation of the curve is y = 7 - x^2 for x ≥ 0.