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## Homework Statement

(a; b) is in terms of D = ( 1,1 ; 1 -1) and (c; d) is in terms of Dx = ( -1,1 ; 0,2), then we need to find a matrix such that

(c;d) = (?, ?; ?, ?)* (a; b).

## Homework Equations

y = Ax >> linear transformation

## The Attempt at a Solution

I know the answer is [1, -3; 1, -1}...but all I can come up with is that

a(1;1) + b(1;-1) = c(-1;0) + d(1;2)