It is common to make measurements of absorbance at two wavelengths and use them to find the

Question:

It is common to make measurements of absorbance at two wavelengths and use them to find the individual concentrations of two components A and B in a mixture. Show that the molar concentrations of A and B are

Where A₁ and A₂ are absorbances of the mixture at wavelengths λ₁ and λ₂, and the molar extinction coefficients of A (and B) at these wavelengths are ε_A1 and ε_A2 (and ε_B1 and ε_B2).