Solve for x and y:x & y:x+y+yx=21 & (x+y)yx=21,x,y are real.
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If x and y are positive integers and 1 + x + y +xy = 21, what is the value of x?
--> --> either and OR and . Notice that and OR and is not possible since in this case either or equals zero and we are told that and are positive integers.
Now, from and --> and AND from and --> and .
(1) y>3 --> , so . Sufficient.
(2) y=6 --> . Sufficient.
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