How do i explain that y=8.75x is linear

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.

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function

Find the domain and range of the following function f(x) = 51x - 21+ 4