Question

B is the midpoint of AC and E is the midpoint of BD. if A(-9, -4) and E(-4, -3), find the coordinates of D

Answer 1

(-3,-7)

Explanation:

• First we will get B by using this formula
• 
  `(x1 + x2)/(2)`
• 
  `( - 9 + - 1)/(2) = - 5`
• 
  `(y1 + y2)/(2)`
• 
  `( - 4 + - 1)/(2) = 1`
• E is mid point between B and D
• To get d we will use the same formula
• 
  `( - 5 + x)/(2) = - 4 \\ x = - 3`
• 
  `(1 + y)/(2) = - 3 \\ y = - 7`
• So D = (-3,-7)

Answer 2

D(-3,-7)

Explanation: