Question 6:
In Diagram below, PQRST is a straight line. Find the value of x.

Solution:

Question 7:
In Diagram below, find the value of y.

Solution:

Question 8:
In Diagram below, PSR and QST are straight lines.

Find the value of x.

Solution:
$\begin{array}{l}\angle UST+\angle STV={180}^{o}\\ \angle UST={180}^{o}-{116}^{o}={64}^{o}\\ \angle PST=\angle QSR\\ {x}^{o}+\angle UST={135}^{o}\\ {x}^{o}+\angle UST={135}^{o}\\ {x}^{o}={71}^{o}\\ x=71\end{array}$