In a Survey It Was Determined That the Demand Equation

Multiple Choice

In a survey it was determined that the demand equation for VCRs is given by ​ ​
The demand equation for blank VCR tapes is given by
​ ​
Where p and q denote the unit prices, respectively, and x and y denote the number of VCRs and the number of blank VCR tapes demanded each week. Determine whether these two products are substitute, complementary, or neither.
​

A) complementary
B) neither
C) substitute