-6x – 2y-z=-17
5x + y - 6z = 19
-4x - 6y-6z =-20
solve for x, y, and z

How many 2/5s are in 1 and 1/2 plz someone me right now

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?

Sole the equation 6n + 9 = -3n - 21 - 6 for n