I need to check that my work is correct for these transformation matrices.
A, a reflection in Ox.
B, an enlargement by a factor 2.
C, a rotation by about O.
D, a stretch by a factor of 3 in the direction Oy.
E, a reflection in the line y=x.
Can someone help me see of they are correct?
Thanks
Hello arzeYou need to remember that you work from right to left when you're combining transformation matrices. So to find the matrix that represents followed by , you need to work out the product .
This is because the transformation matrix is always written on the left of the object that it's working on. So if I transform with matrix , I'll get:Then if we do to this, we get:
So followed by is , not .
Can you see where you've gone wrong now?
Grandad