Jeans (x) cost $15, shirts (y) cost $5, and socks (z) cost $2. On Wednesday a store sold a total of 130 items for a total of $950. Of the 130 items solve; 15 were socks. Which of the following would NOT be an equation in the system for this situation?

A. z=15
B. x+y+z = 950
C x + y + z = 130
D. 15x+5y + 2z = 950​