Graph the set of points. which model is most appropriate for the set?
(-6,-1), (-3, 2), (-1, 4), (2, 7)
a. linear
b. quadratic
c. exponential

Check the slope between the moving points 

slope between (–6, –1) & (–3, 2) = 1 
slope between (-3, 2) & (–1, 4) = 1 
slope between (-1, 4) & (2, 7) = 1 

the points are collinear and make an angle of 45 degrees with the x-axis 

we can have an equation of a line passing through (-6,-1) and slope 1 as 

(y + 1) = 1(x + 6) 
y = x + 5 is your linear model mostly