If P(-1, 1) is the midpoint of the line segment joining A(-3, b) and B(1, b + 4) then b = ?
∴ by Midpoint Formula we have,
⇒ and y
Finding value of b:
⇒
⇒ 2 = 2b + 4
⇒ 2 – 4 = 2b
⇒ b = -2/2
⇒ b = -1
Therefore the value of b is -1.