Answer:

1.

 2.

3.  y = -2x

Teacher Notes: Students should begin the study of transformations with linear functions. All linear functions are a transformation of the parent function y = x. The concepts that are developed with linear functions should be continued with all functions.

Definition:

Function--mathematical rule between two sets which assigns to each number of the first, exactly one member of the second.¹

¹McGraw-Hill Dictionary of Mathematics (1997), Parker, S., editor. (p.94). New York, NY: McGraw –Hill.