Plz i have no clue how to do this i really need

Which expression is equivalent to the expression shown?

Triangle xyz has vertices x(1,3), y(0,0)

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?