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If A={2,3,4} and R={(x,y):y=x+2, x∈A}, what is R?

Answer and explanation

Correct answer: {(2,4),(3,5),(4,6)}

The relation is given in set-builder form by R={(x,y): y=x+2, x∈A}, with A={2,3,4}. To list its ordered pairs, substitute each allowed value of x into the rule y=x+2. For x=2, y=4, giving (2,4); for x=3, y=5, giving (3,5); and for x=4, y=6, giving (4,6). Hence R={(2,4),(3,5),(4,6)}, so option A is correct. Option B would represent y=x, while option C reverses the order of the coordinates. Option D adds 3 instead of 2 to each x. The first coordinate must come from A, and the second coordinate must be calculated using the stated rule.

Related tags

Relations And FunctionsSet-Builder FormOrdered PairsLinear RuleFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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