Ihave 30 mins i just need an answer

Solve the system of equations. y= 2x y= x^2 - 15

This is different from the first one can someone me

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?