The way we can figure this out is by deciding which variable to find first. Since we know that lines p and q are parallel, we know that they intersect line m in the same manner. (They are kinda like the same line, just shifted along line m). Since the 68 degrees and y are at the same relative point on lines p and q along m, we know y = 68.
Now we can easily find x. Since a line is basically just a 180 degree angle no matter how you look at it, we know that 68 + x = 180, as these two angles together become a straight line. Thus, solve the equation and get x = 112 degrees.