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Answer:
 B. x +6y = 4.45; x +12y = 5.65
Explanation:
The problem statement defines the variables for you. Using x and y for the cost of a loaf and the cost of an egg, respectively, each purchase can be represented by an equation of the form ...
 (number of loaves)x + (number of eggs)y = (amount spent)
The first purchase is described as 
- number of loaves = 1
 - number of eggs = 6
 - amount spent = 4.45
 - equation: x +6y = 4.45
 
The second purchase is of a dozen eggs, which is 12 eggs. The description of this purchase can be ...
- number of loaves = 1
 - number of eggs = 12
 - amount spent = 5.65
 - equation: x +12y = 5.65
 
The situation can be represented by the equations shown in the attachment.