# Question #36cc4

##### 2 Answers

Jun 22, 2017

#### Explanation:

Assuming that the rotation is about the origin, then the rotation matrix is:

Evaluating this matrix at

Hence, we have the transformation:

This gives us the two equations:

Using the point

Jun 22, 2017

#### Explanation:

#"I am assuming a rotation about the origin"#

#"under a rotation about the origin of "90^@#

#"a point " (x,y)to(-y,x)#

#rArrB(6,12)toB'(-12,6)#