Section 4-3 was about multiplying matrices, using a complex methos which involves correspondence, multiplication and continuos addition. Size changes was the next chapter discussed. That involes multiplication and size change magntiude called k. Scale changes are denoted S, then two small numbers indicating the change horizontally and then veritcally. For example, S 2,3 would be doubling the x coordinate and tripling the y coordinate.
Transformations make the matrix points move and rotate around the coordinate plane.
Perpendicular lines involves previous formulas like slope, distance and midpoint. Slides and parallel lines were used so we could deduce slopes, and translations. This matrix chapter was interesting. Throughout the chapter, different methods were learned to add, multiply, and subtract matrices. In addition, the scale changes, size changes, reflections, rotations, and translations were studied and compared.