Sophie purchased 8 candles at a total cost of $32. the red candles cost $3 each and the silver candles cost $7 each. the equations and graph below can be used to determine the number of each type of candle sophie purchased, where x represents the number of red candles and y represents the number of silver candles.

a. 7 red candles, 1 silver candle

b. 6 red candles, 2 silver candles

c. 2 red candles, 6 silver candles

d. 3 red candles, 5 silver candles