Is (6,0) a solution of 5x-y=9?

Place the following steps in order to complete the square and solve the quadratic equation,

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?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.