# Matrix transformation

• Jul 20th 2010, 02:50 AM
Stuck Man
Matrix transformation
I am having trouble with part c.
• Jul 20th 2010, 05:00 AM
Ackbeet
I think that what's being asked for is to compute the following multiplication, to start:

$\left[\begin{matrix}1 &-1\\ 2 &-2\end{matrix}\right]\left[\begin{matrix}x\\ mx+c\end{matrix}\right].$

Once you get that multiplication, what do you suppose you should do next?
• Jul 20th 2010, 06:01 AM
Stuck Man
I think it is done like parts a and b but there is much more work.
• Jul 20th 2010, 06:06 AM
Ackbeet
Well, show me how you did part b, for example, and what work you've done on part c.
• Jul 20th 2010, 06:33 AM
HallsofIvy
Yes, c is done exactly like a and b. I think if you try to write both components after your multiplication as "Ax+ B", you will notice an easy relation between the two components.
• Jul 20th 2010, 06:38 AM
Stuck Man
I have chosen (x, mx+c) and (1, m+c). Maybe I should have chosen two specific x values?
• Jul 20th 2010, 06:41 AM
Stuck Man
My images and being displayed too large with IE6. They are ok with Firefox. How are they for you?
• Jul 20th 2010, 07:04 AM
Stuck Man
I've done far more work than is required. Only the top line is needed. y=mx+c maps to y=2x.