Question 438127
General form of the line is 2x - y - 4 = 0.

==> {{{d = abs(ax[0] + by[0] + c)/sqrt(a^2 + b^2) = abs(2*3 + -1*-7 -4)/sqrt(a^2 + b^2) = abs(6 + 7 - 4)/sqrt(5) = 9/sqrt(5)}}}