3pens cost $2.70. what is the cost per pen?

The graph shown is the graph of which function?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.