Select the set of equations that represents the following situation: The cost of eight CDs and fifteen DVDs is $186.31; and the cost of nine DVDs and thirteen CDs is $167.09. How much do a CD and a DVD cost?

A. 8x • 15y = 186.31; 9x • 13y = 167.09,
B. 8x + 15y = 186.31; 13x + 9y = 167.09,
C. 8x + 15y = 186.31; 9x + 13y = 167.09,
D. 8x • 15y = 186.31; 13x • 9y = 167.09

Question

Select the set of equations that represents the following situation: The cost of eight CDs and fifteen DVDs is $186.31; and the cost of nine DVDs and thirteen CDs is $167.09. How much do a CD and a DVD cost? 

A. 8x • 15y = 186.31; 9x • 13y = 167.09,
B. 8x + 15y = 186.31; 13x + 9y = 167.09, 
C. 8x + 15y = 186.31; 9x + 13y = 167.09, 
D. 8x • 15y = 186.31; 13x • 9y = 167.09

anonymous · Answer

I selected option B. It reprsents variable x and y remaining constant. x = CDs and y = DVDs.