Question 1000599
What kind of model?  Only two ordered pair are described.  Only enough information for a linear model.


If y is for fuel efficiency and x is for speed, then the  points for y=mx+b are  (30,30) and (35,20).  What is the slope-intercept equation for the line containing these two points?  At least a couple ways to do this.



{{{m=(20-30)/(35-30)=-10/5=-2}}}


(Here, point-slope form equation is being used...)
{{{y-20=-2(x-35)}}}
Continue on, if you want this in slope-intercept form.