Question 1021162
The line connecting the points (0,-10) and (15,10) is 4x-3y-30 = 0 (in general form). (You should be able to determine this!)

From analytic geometry the distance of a point from a line not containing it is

{{{d = abs(ax[0]+by[0]+c)/sqrt(a^2+b^2)}}}, where ({{{x[0]}}},{{{y[0]}}}) is the given point.

==>{{{d = abs(4*8-3*1-30)/sqrt(4^2+(-3)^2) = abs(-1)/sqrt(25) = highlight(1/5)}}}