Find the Midpoint of the Line Segment Joining the Points $( 19 y , 17 )$

Multiple Choice

Find the midpoint of the line segment joining the points A and B.
-A = (9y, 9) ; B = (10y, 8)

A) $( 19 y , 17 )$
B) $( y , 1 )$
C) $\left( \frac { 19 \mathrm { y } } { 2 } , \frac { 17 } { 2 } \right)$
D) $\left( \frac { 17 y } { 2 } , \frac { 19 } { 2 } \right)$