x =
y =
We are looking for the choice that will result in when 2 is plugged in for S:
Choice (A): . Eliminate. Choice (B): . Eliminate. Choice (C): . Eliminate. Choice (D): . Correct. Choice (E): . Eliminate.
By using the Picking Numbers strategy, we were able to find the answer quickly. The algebraic approach is a little tricky to identify, requires calculation with variables, and contains a subtle last step. On an algebra problem that doesn't have a familiar structure (unlike, for example, a quadratic) and that has multiple variables, consider Picking Numbers. It may save you some time and decrease your chances for error.
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