What is solution for x if: 3x-6=6x+3

Given the graph below state whether or not the relation is a function, and give the domain and range.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Need this at the city museum, child admission is 6 and adult admission is 9.20. on tuesday, 132 tickets were sold for a total sales of 961.60. how many adult tickets were sold that day?