Could someone with the questions in the images below. it would be much appreciated.

#2.   i=B   ii=F   iii=A   iv=D   v=C   Graph E is not used.  In graph E the heat is turned on the temperature rises steadily then the window is opened and the temperature falls steadily.

#3.  i=D   ii=C   iii=B      Graph A is not used. In graph A the climber climbs steadily at a steady rate, then stops for one break and then continues on his climb.

i believe it is c.y = 9x

rise over run. 9 units up over 1 unit right or 9/1