Let R be a relation defined as xRy if and only if 2x + 3y = 20, where x, y ∈ N. How many elements of the form (x, y) are there in R?

Let R be a relation defined as xRy if and only if 2x + 3y = 20, where

1.	Let R be a relation defined as xRy if and only if 2x + 3y = 20, where x, y ∈ N. How many elements of the form (x, y) are there in R?
A.	2
B.	3
C.	4
D.	6
Answer» C. 4

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