Write a question that can be answered by making a picture graph

In two or more complete sentences describe how to determine the appropriate model for the set of data, (1,1), (3,2), (6,3), (11,4).

Me! last question, and i'm stuck! write the algebraic expression that models the word phrase. the product of 2 divided by the number h and 8 more than the number k

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?