question_answer

The following system of equations represents the profit margin of two major companies where x represents sales and y represents discounts to clients. \[\left\{ \begin{align}   & 3x-4y=12 \\  & x-2y=2 \\ \end{align} \right.\] Which of the following is the best approach to solving this system of equations?

A)  Multiply the expression x-2y by 3 and add the first equation to the second equation

B)  Substitute the expression 2 + 2y for x in the first equation of the system

C)  Add the first equation to the second equation

D)  Substitute the expression x-2y for x in the first equation of the system