I don't really like these algebra problems pretending to be geometry. There are much better ways to combine algebra and geometry.
OK, a parallelogram. QR=PS, PQ=RS, PT=TR, QT=TS. Geometry done. We substitute for the last two,
2x = y + 4
x + 2 = y
Subtracting equations,
x - 2 = 4
x = 6
y = x + 2 = 8
Answer: x=6, y=8
