Enlargements on a coordinate grid

Students enlarge shapes around the grid to create the word 'big&'. It&';s tough doing these enlargements ones, the students find them harder and as the shapes get larger it's hard to get the letters right. Still, this seems to work well enough.

I&'ve included the autograph file I created it with (note it&';s the newest version so you won't be able to look at it with the old one).

just done this in class and the point (-1,-10) should read (1,-10)