What kind of line? In order to answer this we have to know if its a graph line such as linear or if its a number line.
Answer:
The scale factor for the resultant rectangle is
units.
Step-by-step explanation:
Given two rectangles with sides 3 units and 7.5 units.
We have to find the scaling factors so that we can obtain bigger rectangle of 7.5 units from smaller rectangle of 3 units.
Scale factor is defined as the ratio of corresponding side of given figure to the corresponding side of resulting figure.
That is 
Here, 

Hence, the scale factor for the resultant rectangle is
units.
Can you show me a picture of the problem?
Answer:
-13
Step-by-step explanation:
(-1/3)*6 = -2
f(-1/3) = -2 -11
f(-1/3) = -13