Rate of particular reaction increases in the forward direction with the increase in the concentration of the reactant.
Reaction involved-
A + B => C
=> - d[A]/dt = K[A][B] (- sign indicate the decrease in rate of backward direction and increase in forward direction)
This suggest that with increase in concentration of A or B ,.the reaction move in forward direction and more product formation occur.
Similarly for the decrease in the concentration of reactant, the reaction move in backward direction.
=> d[C]/dt = K[A][B]