How to find slope of the least squares regression line

If 1/2 is half of 1, what is 1/2 of 2,3, and 4?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

First work with stencil one. use a combination of reflections, rotations, and translations to see whether stencil one will overlap with the original pattern. list the sequence of rigid transformations you used in your attempt, noting the type of transformation, the direction, the coordinates, and the displacement