Explanation:
you mean the distance between A and B ?
the x and y coordinate differences create a right-angled triangle with the distance being the Hypotenuse (the side opposite of the 90° angle).
so, we use Pythagoras to solve this.
c² = a² + b²
c being the Hypotenuse, a and b are the legs.
distance² = (-5 - -3)² + (-4 - 3)² = (-5 + 3)² + (-4 - 3)² =
= (-2)² + (-7)² = 4 + 49 = 53
distance = sqrt(53) = 7.280109889... ≈ 7.28