Solve t for Parametric Equations: x=t^2+t, y=t^2-t

[sara_87]

Homework Statement

i want to make t the subject of any of the following equations inorder to find the cartesion equation. any ideas?:
x=t^2+t
y=t^2-t

Homework Equations

The Attempt at a Solution

 

[rootX]

You can assume x,y are constants and find t! (Quadratic formula )

or use algebraic manipulations ... one is
x-y = 2t
once again find t

 

[arildno]

Well, adding the equations yields x+y=2t^2, whereas subtracting yields x-y=2t
See if you can use this.