Question

What degree of rotation is represented in this matrix?

Answer 1

A. 270 degrees
B. 180
C. 90
D. -90

Answer 2

here's how it works. we multiply each entry in the 1st row times x and add them up.
so we get 0*x+(-1)*x=-x
now you do the second row on y

Answer 3

and then you need the formulas that I gave you before.

r u with me?