Well in this case, to see which is greater, let's just say that:
x=4 <--- 4 is less than 5
y=5
Now substitute:
2x-y 2y-x
2(4)-5 2(5)-4
8-5 10-4
3 6
Which of these is greater, 3 or 6? 6, obviously. Therefore, we know that 2y-x is greater.
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