Answer
$(-5.65,2)$
Work Step by Step
We know that the midpoint of the line segment whose endpoints are $(x_{1},y_{1})$ and $(x_{2},y_{2})$ is the point with coordinates $(\frac{x_{1}+x_{2}}{2},\frac{y_{1}+y_{2}}{2})$.
Therefore, a line with endpoints $(-4.6, 2.1)$ and $(-6.7,1.9)$ will have a midpoint of $(\frac{-4.6+(-6.7)}{2},\frac{2.1+1.9}{2})=(-\frac{11.3}{2},\frac{4}{2})=(-5.65,2)$.