The school that Stefan goes to is selling tickets to a choral performance. On the first day of ticket sales, the school sold 7 senior citizen tickets and 5 child tickets for a total of \( \$ \) 163. The school took in \( \$ 68 \) on the second day by selling 3 senior citizen tickets and 2 child tickets. We are interested in finding the price of a senior ticket and a child ticket using a system of equations. Use the information provided to answer the following questions: (a) Identify what \( x \) and \( y \) should represent in this situation. A \[ \boldsymbol{x}=\text { total number of attendees. } \] \[ y=\text { total revenue. } \] B \( \boldsymbol{x}= \) price of a senior citizen ticket. \( \boldsymbol{y}= \) price of a child ticket. c \( x= \) senior citizen. \( y= \) child. D \( x= \) number of senior citizen tickets sold. \( y= \) number of child tickets sold. (b) Translate the first sentence: "On the first day, the school sold 7 senior citizen tickets and 5 child tickets for a total of \( \$ 163 \) ", into a math equation.