38. Exemplar Exercise Problem XVII

If \(\left( a,b  \right)\)  is the midpoint of the line segment joining the points \(A \left( 10, -6 \right)\) and \(B (k,4)\) and \(a-2b = 18 \), find the value of \(k\) and the distance \(AB\).

 

 

The value of k is .