x =
y =
4 and 2 are good choices for x and y. Both S and the fraction term in the denominator of T will become integer values if 4 and 2 are used, and integers are usually easier to manage than fractions.
Now that we know that when we substitute 4 for x and 2 for y, S = 2 and T = , we can go on to test the answer choices.
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