Given the equation below

Given the following ordered pairs below

To find out if the ordered pairs are solutions to the given equation,
Substitute for x and y to find out if its equal to the right side
Given the ordered pair (3,11)
Where x = 3 and y = 11, substitute for x and y into the equation

The ordered pair solution is not equal to the right side because result is 20 which is not equal to the right side.
Thus, the answer is A
For the ordered pair (7,0)
Where x = 7 and y = 0, substitute for x and y into the equation

The ordered pair solution is equal to the right side because result is 21
Thus, the answer is B
For the ordered pair (0,21)
Where x = 0 and y = 21, substitute for x and y into the equation

The ordered pair solution is equal to the right side because result is 21