When u are doing a rotation and it’s a 90 degrees. do you have to flip the coordinates and change the signs?

Hello!

When doing a 90 degree reparation you flip the coordinates and apply to the sign of the quadrant.

For example, If it flips into quadrant one, they will both be positive.

So, in this case it would be Triangle 4.

Hope this helped!

The solution of the system of linear equations is b. (2,-3) because the solution is the poi (point of intersection)