The final exam for Miguel's math class is worth 120 points and will be comprised of an assortment of 50 multiple choice and free-response questions. Each multiple choice question is worth 2 points and each free-response question is worth 3 points. Which system of linear equations can be used to find x, the number of multiple choice questions on the final, and y, the number of free-response questions? A.
{x+y=120
{3x+2y=50
B.
{x+y=50
{3x+2y=120
C.
{x+y=120
{2x+3y=50
D.
{x+y=50
{2x+3y=120