The molarity and mole fraction are both indicative of concentration. Molarity is described as the Moles of solute/Litres of solution and is denoted by the symbol M. The mole fraction is described as the moles of solute/total number of moles. If you observe both equations, you can determine that both are indicating that the number of moles in a solute compared to either the volume or the total number of moles in the solution will give you the concentration respectively.