You would have to add 47.50 + 122 to get 169.5 dollars. to get the amount of money he made in the summer, you would have to multiply 169.5 by 2 which would equal 339 dollars. so he made 339 dollars over the summer :)
1a. It is because each x only has 1 y and it has an equation 1b. It is not a function because each x has more than 1 y. 1c. It is not a function because there can be no equation written for this graph.