To answer this question it is necessary to find the equation of the given lines
Find the equation for PQ. To do it, find the slope of the equation:

Now, use the point slope formula to find the equation of the line:

Parallel lines have the same slope, it means PQ and RS have the same slope, then RS has a slope of 11/3
Use the point slope formula to find the equation of the line RS:

Now, use this equation to find y when x is 6 (which corresponds to point S):

y has a value of 10.