The formula for the distance (d) from point (x, y) to the line ax +by +c = 0 is
.. d = |ax +by +c|/√(a^2 +b^2)
The general form equation for your line is
.. x -y +4 = 0
so the distance to (4, -2) is
.. d = |4 -(-2) +4|/√(1^2 +(-1)^2) = 10/√2 = 5√2
.. d ≈ 7.1 . . . . . . . . . . corresponds to selection A
