Can someone help me with 13

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

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?

Solve the system of equations. x=-2y+1 and x+2y=9. show work