Assuming that y-axis (OP) represents the price of soup and x-axis (OQ) represents the number of cups that can be supplied, then when the price is at 15, the number of cups that can be supplied is 10.
If the price increases to 30, then the number of cups that can be supplied is 30. Putting everything constant, this shows that the supply is willing to supply more as the prices increases, if everything else is constant.
This confirms the relationship between price of a commodity and its supply
