- #1
kris89
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Homework Statement
Given a transformation of the plane F(x,y) = (2x+y,x-2y), find F-1.
Homework Equations
Actually this exercise had an item (a) which I had to prove this is a transformation. So I proved this function is injective and surjective.
I know F(x,y) = (u,v) IFF F-1(u,v) = (x,y).
The Attempt at a Solution
I did it, but I don't know if this is the real solution...
F(x,y) = (u,v) IFF F-1(u,v) = (x,y).
u = 2x + y
v = x - 2y
Solving this, I concluded that: x = (v+2u)/5 and y = (u-2v)/5
Is this the solution? F-1 = ((v+2u)/5, (u-2v)/5) or do I have to do anything else?