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If (R={(x,y):y=x+3,\ x\in{1,2,3}}), what are the ordered pairs of (R)?

Answer and explanation

Correct answer: ({(1,4),(2,5),(3,6)})

The direct answer is A: the ordered pairs are {(1,4),(2,5),(3,6)}. The rule says y=x+3 and x can be 1, 2, or 3. Step 1: for x=1, y=1+3=4, giving (1,4). Step 2: for x=2, y=2+3=5, giving (2,5). Step 3: for x=3, y=3+3=6, giving (3,6). Option A lists all three pairs correctly. Option B keeps y equal to 3 and ignores the rule y=x+3. Option C reverses the order of each pair; (x,y) must be written with x first. Option D adds 4 instead of 3. The useful method is to substitute every allowed x and write the result as (x,y).

Related tags

Relations-FunctionsSet-BuilderOrdered-Pairs

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