Need on this question. how do you find x?

Choose the point slope form of the equation below that represents the like that passes through the points (-6,4) and (2, 0)

On a piece of paper graph f(x)=5•(0.4)^x

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?