Question 853197
A liner rule is of the form y = x+a.  The first coordinate in the pair is x.  What do you have to add or subtract to/from it to get the second coordinate, which is y?<P>
(-1,-7)  y = x + a == -7 = -1 + a<P>
-6 = a.  So the equation is y = x -6<P>
(0,-3)  y = x + a == -3 = 0 + a == -3 = a.  The equation is y = x - 3<P>
(1,1) There is no difference so y=x<P>
(2,5) The difference is 3.  y = x+3<P>
(4.13) The difference is 9. y=x+9<P>
(5,17) y=x+12