The direct and inverse variations are used ion real life to compare and contrast the relationship between various things. These variations assist in determining the similarities and difference in quantity and ratio of various things.
direct variation is the simple algebraic concept of balancing the ratio of various things. for ex: Steve bought 15 balls for $225. he bought 31 more balls.what is the price of the total no: of balls? this would give you a clear idea of direct variation.