Mya purchased 4 bags of snacks represented by a cost of S cents per bag. She also purchased 4 cups of strawberry yogurt, represented by a cost of Y cents per yogurt, 3 cups of lemon yogurt represented by L and 2 cups of vanilla yogurt represented by V. Each bag of snacks cost $0.75, each cup of strawberry and lemon yogurt is $0.50 and the vanilla yogurt is $1.00