We are given coordinates of the end points of the a segment AB as
A(−1, 9) and B(3, 8).
[tex]\mathrm{Midpoint\:of\:}\left(x_1,\:y_1\right),\:\left(x_2,\:y_2\right):\quad \left(\frac{x_2+x_1}{2},\:\:\frac{y_2+y_1}{2}\right)[/tex]
[tex]\left(x_1,\:y_1\right)=\left(-1,\:9\right),\:\left(x_2,\:y_2\right)=\left(3,\:8\right)[/tex]
[tex]=\left(\frac{3-1}{2},\:\frac{8+9}{2}\right)[/tex]
[tex]=\left(1,\:\frac{17}{2}\right)[/tex]
17/2 can be written as decimal 8.5.
Therefore, coordinate of the midpoint is (1, 8.5)
