Question 14926
 (9,5) to the line 4x - 3y = -4

 The distance from a point P(x,o,yo) to a line ax+by+c = 0 is
 
 d = {{{ abs(a x[o] + b y[o] + c )/ sqrt(a^2+b^2) }}}

 so, we have d = |36-15+4|/ 5 = 5 
 (Try to compute with your mind. Absolutely no calculators.)


 Kenny