Question



Answer 1

Answer:

(2, -10)

Step-by-step explanation:

The midpoint of a line connecting 2 points (x₁, y₁) and (x₂, y₂) is given by
$(x_{M}, y_{M}) = \left(\dfrac {x_{1} + x_{2}} {2} , \dfrac {y_{1} + y_{2}} {2}\right)$

We will assume that the coordinates of S are (x₂, y₂) and these have to be determined

First, add the x coordinates and divide by 2. This gives you the
x-coordinate of the midpoint. Then add the y coordinates of the two points and divide by 2 to get the y-coordinate of the midpoint

Here we are given the midpoint and coordinates of one point and we are asked to find the coordinates of the second point

• First, take the midpoint formula
  $(x_{M}, y_{M}) = \left(\dfrac {x_{1} + x_{2}} {2} , \dfrac {y_{1} + y_{2}} {2}\right)$
  
• Break it down so you have separate equations for the x and y coordinates of the midpoint
  $x_{M} = \dfrac {x_{1} + x_{2}} {2}$
  $y_{M} = \dfrac {y_{1} + y_{2}} {2}$
  
• Rearrange each equation so that you're solving for x₂ and y₂
  $x_{2} = 2x_{M} - x_{1}$
  $y_{2} = 2y_{M} - y_{1}$
  
• Using the values provided i.e. x₁ = 0, y₁ = 4 and $x_M=1, y_M = -3$
  $x_M = 2(1) - 0 = 2$  
  $y_M = 2(-3) -4$ $= -6-4 = -10$
  
• So the coordinates of S are (2, -10)