To answer this (specifically the first one) you have to count how many spaces each point moves. (How many spaces up/down does it go? Left/right?) then you put rise (up/down) over run (left/right) and you should get the slope!
Baker's Flour in kg
Y x x
A x x
X x x x x x x
I -----------------------------------------------------------
S 2 1/2 3 1/4 4 4 1/4 4 1/2 5
X axis
It would be 3.5 in each bag after the baker redistributes the flour. This is because the total flour would be 35 kg. 35 divided by 10 is 3.5 kg of flour in each bag.
