Question which-
Which of the following ordered pairs (x, y) satisfies the system of inequalities above?
Which of the following ordered pairs ( x , y ) satisfies the system of inequalities
Hard-difficulty · SAT Math · Linear Inequalities in One or Two Variables — Systems of inequalities and feasible region. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice D is correct. Any point (x, y) that is a solution to the given system of inequalities must satisfy both inequalities in the system. The second inequality in the system can be rewritten as . Of the given answer choices, only choice D satisfies this inequality, because inequality
is a true statement. The point
also satisfies the first inequality.
Alternate approach: Substituting into the first inequality gives
, or
, which is a true statement. Substituting
into the second inequality gives
, or
, which is a true statement. Therefore, since
satisfies both inequalities, it is a solution to the system.
Choice A is incorrect because substituting −2 for x and −1 for y in the first inequality gives , or
, which is false. Choice B is incorrect because substituting −1 for x and 3 for y in the first inequality gives
, or
, which is false. Choice C is incorrect because substituting 1 for x and 5 for y in the first inequality gives
, or
, which is false.
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