By which matrix should you multiply vector [1 3] to rotate it 180°?

We have that the Rotation of matrix will be rotated 180 degree if is multiplied by  

Option D is correct

From the Question we are given

it is important to note that the rotation of the identity matrix   rotating across the Cartesian co-ordinate is a is going to give a matrix    

Therefore

The Rotation of matrix will be rotated 180 degree if is multiplied by  

Option D is correct

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B

Step-by-step explanation:

Rotation 180° is accomplished by negating both the x- and y-coordinates. That is, you multiply each of them by -1. You want the opposite of the identity matrix, so matrix B.

the answer is y < -3 or   y > 3

-3y > 7 + 2

-3 y > 9

y < -3