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If (x>1) and (y>2), which conclusion is always true for (x+y)?

Answer and explanation

Correct answer: (x+y>3)

Direct answer: option A, x+y>3. We are told x>1 and y>2. Add the inequalities term by term: x+y>1+2, so x+y>3. This conclusion is always true, although the sum need not equal 3; for example, x=2 and y=3 gives 5. Option A is correct because both quantities are strictly greater than their lower bounds. Option B, x+y<3, is wrong because choosing x=2,y=3 gives a sum of 5. Option C, x+y=3, is wrong because the values can be larger than 1 and 2, and strict inequalities prevent equality with the lower-bound sum. Option D, x+y≤3, is also wrong for the same example and is weaker in the wrong direction. Adding inequalities with the same direction is valid here. Memory cue: greater than plus greater than gives greater than the sum of the bounds.

Related tags

Addition Of InequalitiesTwo VariablesReasoning

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