The equation p = 2.5m +35 represents the price p in dollars of a bracelet where

The given equation = P = 2.5m + 35, where p = price in dollars of a bracelet and m is the cost of the material.
Total price of bracelet = 115 dollars. Find the cost of the material
=> p = 2.5m + 35, where p =115
=> 115 = 2.5m + 35
=> 115 – 35 = 2.5m
=> 80 = 2.5m
=>  80 / 2.5 = 2.5m/2.5
=> 32 = m
Thus, the cost of the material is 32 dollars.

The answer is (2,-2) I think