Answer:
[tex]k\text{ = 6}[/tex]Explanation:
Here, we want to get the value of k
From what we have in the question, we can deduce that:
[tex]XZ\text{ = XY + YZ}[/tex]Substituting the values;
[tex]\begin{gathered} 4k\text{ + 38 = 3k-2 + 7k+4} \\ 4k\text{ + 38 = 10k+2} \\ 10k-4k\text{ = 38-2} \\ 6k\text{ = 36} \\ k\text{ = }\frac{36}{6} \\ k\text{ = 6} \end{gathered}[/tex]