Surprising Transformations

Stage: 3 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3
You may want to have a look at Translating Lines and Reflecting Lines before working on this problem.

Think about what happens to the intercept and gradient after each transformation.

How can I combine these transformations so that the gradient stays the same and the intercept moves down 9 places?

Published May 2009.