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Question
Write the relation in the Roster Form. State its domain and range
R3 = {(x, y)/y = 3x, y∈ {3, 6, 9, 12}, x∈ {1, 2, 3}
Solution
R3 = {(x, y)/y = 3x, x∈ {1, 2, 3}, y∈ {3, 6, 9, 12}}
Here y = 3x
When x = 1, y = 3(1) = 3
When x = 2, y = 3(2) = 6
When x = 3, y = 3(3) = 9
∴ R3 = {(1, 3), (2, 6), (3, 9)}
Domain (R3) = {1, 2, 3}
Range (R3) = {3, 6, 9}
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