parametric graphs and questions concerning scaling

1. For Carrie, did you subtitue t for y and did you also state in y1 that y=t. This should work.
2. The book is kind of confusing me with the scaling of graphs. I thought when you scale a graph by a factor of a, the equation needs to have input the value of 1/a, or whatever the inverse of the scale may be. Can someone clarify this?