Graph the set of points. which model is most appropriate for the set? (-6, -, ,4)(2,7) can't figure out what graph it goes to

For this case, the first thing to do is to graph the following ordered pairs:
 (-6, -1)
 (-3, 2)
 (-1,4)
 (2,7)
 We observe that the graph is a linear function with the following equation:
 y = x + 5
 Note: see attached image.
 
 The function that best represents the ordered pairs is:
 y = x + 5

The answer should be c.