If line $L$ in the $xy$-coordinate plane has a positive slope, what is the $x$-intercept of $L?$

If line $L$ in the $xy$-coordinate plane has a positive slope, what is the $x$-intercept of $L?$

(1) There are different points $(a, b)$ and $(c, d)$ on line $L$ such that $ad = bc.$

(2) There are constants $m$ and $n$ such that the points $(m, n)$ and $(-m, -n)$ are both on line $L.$

Answer: D

Source: Manhattan GMAT

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