Hey UBCBOY.
In terms of the formula, do you know the formula to find the inverse of a 2x2 matrix?
I don't understand how to do this question! Doesn't it just mean to find the inverse of matrix T?
Find a formula for T^-1 if
T(x1,x2) = (8x1 - 4x2, 6x1 - 6x2)
Therefore:
T^-1(x1,x2) = (_x1 + _x2,_x1 + _x2) ?
What's the matrix of T...
Wouldn't it be like:
[8 -4]
[6 -6] ?!
Thank you so much...I'm confused.
Are you required to use matrices? You are given T in terms of equations, not matrices. From "T(x1,x2) = (8x1 - 4x2, 6x1 - 6x2)"
you know that y1= 8x1- 4x2 and y2= 6x1- 6x2. Solve those two equations for x1 and x2 in terms of y1 and y2, then, to get the form you want, swap "x" and "y".