Transformation of Matrices!!! Please Help?

Question

The vertices of Triangle XYZ are X(1,-1) Y(2,4) Z(7,-1). The triangle is reflected over the line y=x

18. Write the coordinates of triangle XYZ in a vertex matrix

19. Graph triangle XYZ and X'Y'Z'

Answer 1

Make a 2 by 2 matrix with 0 1 in the top row and 1 0 in the bottom row This is the matrix you use to use for reflection over the y = x axis
so mutltply that matrix times the one for your triangle whic should be
top row 1 2 7
bottom row -1 4 -1
Hopefully you can now set this up and do the multiplying.
After you multiply you will have the new coordinates and you will be able to graph both of the triangles