I need help please. im not good at algebra.​

Cam bought some used books for $4.95. he paid $0.50 each for some books and $0.35 each for the others. he bought fewer than 8 books at each price. how many books did cam buy?

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

Is the point (0, 8) on the x-axis or y-axis? how do you know?