Correct Answer - Option 2 : 3
Concept:
If x ∈ R then we express it by writing xRy and say that " x is related to y with relation R"
Thus, (x, y) ∈ R ⇔ xRy
Calculation:
Given
2x + 3y = 20
The relation R can be written as
R = {(1,6), (4, 4), (7, 2)}
There are 3 elements in the form (x, y) are there in R.