Question

Reflect the given triangle over the line
y = -X

Answer 1

3 4 -7 1

Explanation:

acellus

Answer 2

9514 1404 393

Answer:

`\left[\begin{array}{ccc}0&3&4\\0&-7&1\end{array}\right]`

Explanation:

Reflection over the line y=-x swaps the coefficients and negates both of them.

(x, y) ⇒ (-y, -x)

Effectively, the coordinate matrix is pre-multiplied by ...

`\left[\begin{array}{cc}0&-1\\-1&0\end{array}\right]`