Answer:
see the explanation
Explanation:
we have that
The scale factor is

we know that
To find the length of the segment CZ, multiply the segment CR by the scale factor
so

substitute

therefore
Roy's diagram is not correct, because on the graph, Roy draws the length of the CZ segment equal to 10 units instead of 6 units.
Roy is using a scale factor equal to 2.5 instead of 1.5.