Description: Sal demonstrates solving a word problem by writing a system of equations and solving using the elimination method. Can we solve for the price of a cup of coffee and croissant using the information into a system of linear equations in two variables? So we're looking for two things: the price of a cup of coffee and the price of a croissant. So let's let x be equal to the price of the cup of coffee.*Teacher Advisor is 100% free.