Originally Posted by

**treetheta** let T: R^2 -> R^2 be a linear transformation define by

$\displaystyle T \left[ \begin{array}{c}x\\y\end{array} \right] =\left[ \begin{array}{c}x+y\\x-y \end{array} \right]$

they are matrix they are both 2x1 incase you were wondering wth i did xD

show that T has an inverse

alright so im pretty sure i have to show that the LS has an inverse for T to have an inverse but i never really did any any question with a 1x2 matrix so i dont know how to do the inverse.. can someone help me out please