Marla and kelly purchased flowers. marla purchased 7 roses for x dollars each and 10 daisies for y dollars each. she spent $40.50 on the flowers. kelly bought 3 roses and 15 daisies at the same cost as marla. she spent $30.75 on her flowers. the system of equations below represents this situation.

7x+10y=40.5
3x+15y=30.75

which statement below is correct?

a) marla spent $3 more on roses than she did on daisies.

b) roses cost $2.75 more than daisies.

c) kelly spent more on roses than she did on daisies.

d) marla spent 6 times as much on roses than she spent on daisies.