Sadie buys 6 postcards and 4 souvenir magnets for $ 16.90. Cruz buys 3 postcards and 3
magnets for $ 10.80. Which system of linear equations can be used to solve for the cost
of each postcard, p, and each magnet, m?

A) 6p + 4m = 16.9. C. 6p + 4m = 16.9
3p + 4m = 10.8. 3p + 3m = 10.8

B) 6p = 16.9 + 4m. D. 6p = 16.9 + 4m
3p + 3m = 10.8 3p = 10.8 + 3m