Perpendicular Bisector calculation given 2 points

How to calculate an equation of the perpendicular bisector of the line joining (-1, -2) & (3, 6) by working out the midpoint and a perpendicular gradient.
SUBTITLED
NOTE: The word "negative" was omitted...but the symbol correctly appears on screen! Can you spot when?
0:00 Introduction
0:25 Sketch of lines
1:08 Midpoint
1:55 Perpendicular gradients
3:25 Equation of straight line
4:25 Check solution

[@daisy7341]

rlly helpful , i’m doing gcse further maths and this helped ❤

[@MathsWithJay]

Excellent!