Not sure how to solve

The school that imani goes to is selling tickets to the annual dance competition. on the first day of the ticket sales the school sold 7 adult tickets and 5 child tickets for a total of $96. the school took in $40 on the second day by seling 3 adult tickets . find the price of an adult ticket and the price of a child ticket. solve by using substitution elimination college prep algebra math heres the 2 equations i came up with 7x+5y=96 and 3x+2y= -40 show all workiv be stuck on this.

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.