Which of these lines in the xy-plane does not contain any point with two negative coordinates? Choose the correct answer:
A) y = 2x  B) y = x + 9  C) y = x^2 - 3  D) y = x^3 + x  E) y = x^4
x^4 is 0 when x is 0 and positive for all other values of x.   The answer is y = x^4.
<result>E</result>
Which of these lines in the xy-plane does not contain any point with two negative coordinates?