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The relation (R={(x,y):x+y=5}) is considered from (A={1,2,3,4}) to (B={1,2,3,4}). What is (R)?

Answer and explanation

Correct answer: It is a function and range is ({1,2,3,4})

The direct answer is A: R is a function and its range is {1,2,3,4}. The relation requires x+y=5, so solve for y: y=5-x. Check every x in A. For x=1, y=4; for x=2, y=3; for x=3, y=2; for x=4, y=1. Thus R={(1,4),(2,3),(3,2),(4,1)}. Each input has exactly one output, and every output belongs to B, so R is a function. The outputs together are {1,2,3,4}, the range. Option A is correct. Option B is wrong because x=1 has only one image, 4. Option C is wrong because x=4 has image 1. Option D is wrong because the range contains y-values, not the single sum 5. Check inputs one by one.

Related tags

Linear RelationFunction TestRangeHard

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