Ineed with this as soon as possible. #7 & 8

Ineed to learn how to solve this problem

Explain how you do each step what term makes it inconsistent y=2x - 4 ?

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?