Answer:
"line" a straight line graph is always linear once the line isn't straight, it'll no longer be called a line and will never be linear anymore
Given:
The functions are


To find:
The functions
and
.
Solution:
We know that,




And,





Therefore, the required functions are 
and
.
F=9/5c+32
-31=9/5c+32
-63=9/5c
-35=c