2/3m=-12 can anyone explain in words?

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

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.

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?