Well you don't tell us the cost per flower or if the price of a corsage is determined solely by the number of flowers it contains. Some flowers cost more than others. But let's assume:
- All flowers cost the same = (price per flower)
- The cost of a corsage depends only on the number of flowers it contains
The first corsage would cost:
Cost of first corsage = (5 flowers)*(price per flower)
The second corsage would cost:
Cost of second corsage = (7 flowers)*(price per flower)
The total cost would be:
Total Cost = (Cost of first corsage) + (Cost of second corsage)
= (5 flowers)*(price per flower) + (7 flowers)*(price per flower)
= (12 flowers)*(price per flower)
If you let y = total cost and x = the price per flower, it would be:
y = 5x + 7x = 12x