Question

R(-9,4) and S(2,-1) Find T ..... Where S is the Midpoint of RTS(-4,-6) and T(-7,-3) Find R ..... Where S is the midpoint of SR

Answer 1

Answer:

The coordinate of the point T is (13, -6)

The coordinate of the point R is (-1, 9)

Explanation:

Given the points R(-9,4) and S(2, -1), where S is the midpoint of RT, we want to find T.

The coordinate of the midpoint of a line is given by the formula:

$M=(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})$

Since S is the midpoint, then

$(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})=(2,-1)$

Where:

$\begin{gathered} x_1=-9 \\ y_1=4 \\ x_2=? \\ y_2=\text{?} \end{gathered}$

So,

$\begin{gathered} \frac{x_1+x_2}{2}=2 \\ \\ \frac{y_1+y_2}{2}=-1 \end{gathered}$

Implies:

$\begin{gathered} \frac{-9_{}+x_2}{2}=2 \\ \\ -9+x_2=4 \\ x_2=4+9=13 \end{gathered}$$\begin{gathered} \frac{4_{}+y_2}{2}=-1 \\ \\ 4+y_2=-2 \\ y_2=-2-4=-6 \end{gathered}$

Therefore, T = (13, -6)

........................................................................................................................

Given S(-4, -6) and T(-7, -3)

Following the same steps as the one above, we want to find R, where T is the midpoint.

Here, the given parameters are:

$\begin{gathered} x_2=-7 \\ y_2=-3 \end{gathered}$$\begin{gathered} x_1,y_1 \\ \text{are the unknown } \end{gathered}$

Now, we have:

$\begin{gathered} \frac{x_1+x_2}{2}=-7 \\ \\ \frac{y_1+y_2}{2}=-3 \end{gathered}$$\begin{gathered} \frac{x_1-7}{2}=-4 \\ \\ x_1-7_{}=-8 \\ \\ x_1=-8+7=-1 \end{gathered}$$\begin{gathered} \frac{y_1-3}{2}=-6 \\ \\ y_1-3=-12 \\ \\ y_1=-12+3=-9 \end{gathered}$

The coordinate of the point R is (-1, 9)