Question 1164438
Plot those points.  The graph looks like a line.  Draw line through the points.


Identify y-intercept:  It looks like  (0,-4).

Slope, from ANY pair of points:  m=1.25

Function according to form y=mx+b:
{{{f(x)=1.25x-4}}}



The y-intercept WAS already given.
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{{{m=(8.4+4)/10=1.25}}}
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{{{m=(-1.5-(-6.5))/4=1.25}}}