Which set of ordered pairs represents a function? \{(-6, 5), (-1, -2), (-4, -6), (-9, 5)\}{(−6,5),(−1,−2),(−4,−6),(−9,5)}
\{(-4, -4), (-4, 8), (-7, 1), (9, 7)\}{(−4,−4),(−4,8),(−7,1),(9,7)} \{(-3, 4), (6, 1), (-8, -8), (-8, -5)\}{(−3,4),(6,1),(−8,−8),(−8,−5)}
\{(7, 9), (0, 4), (-2, 1), (7, 1)\}{(7,9),(0,4),(−2,1),(7,1)}

An appliance store sells a washer-dryer combination for $1800. if the washer costs $300 more than the dryer, find the cost for each appliance.

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.

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?