A. The total cost for Greg's sand pit can be represented by the equation y=5x +200.
B. The total cost for Sadie's sand can be represented by the equation y=50x+12.
C. 20 tons of sand will cost 300 dollars for both sadie's Sand and Greg's sand pit.
D. If the elementary school needs 30 tons of sand, Sadie's sand would cost less.
E. The system has infinite solutions.
Select all that apply.