Question 141528
Pick any two ordered pairs represented in the table.  Call one of them point 1 and the other one point 2.  Subtract the f(x) value for the first point from f(x) value of the second point.  Then subtract the x value for the first point from the x value of the second point.  Divide the f(x) difference by the x difference.  Call that value m.


One of your points has a 0 for an x-coordinate, call the y-coordinate of that point b.


Now replace m and b in {{{y=mx+b}}} with the values you determined above.