Which of these lines in the xy-plane does not contain any point with two negative coordinates?	Answers.
A) y = 5x
B) y = x + 6
C) y = x^2 - 7
D) y = x^3 + 2x
E) y = 3x^6
3x^6 is 0 when x is 0 and positive for all other values of x.   The answer is y = 3x^6.
<result>E</result>
Which of these lines in the xy-plane does not contain any point with two negative coordinates?