- #1

Math100

- 690

- 180

## Homework Statement

## Homework Equations

None.

## The Attempt at a Solution

I know that the standard matrix of a counterclockwise rotation by 45 degrees is:

[cos 45 -sin 45]

[sin 45 cos 45]

=[sqrt(2)/2 -sqrt(2)/2]

[sqrt(2)/2 sqrt(2)/2]

But the problem says "followed by a projection onto the line y=-2x", how do I find that?