Function or not a function

3(10x-y)-5(x-y^2) need this solved asap

Jayda's house is located at (1, 5). she can walk in a straight line to get to cristian's house. a fast-food restaurant is located at (11, 0) and partitions the way from jayda's house to cristian's house by a ratio of 5: 1. find the coordinate of cristian's house. me . im a little stuck

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike