Mashaal Masha
In the $xy$-plane, line $k$ is defined by $x+y=0$. Line $j$ is perpendicular to line $k$, and the $y$-intercept of line $j$ is $(0,3)$. Which of the following is an equation of line $j$ ?
Difficulty: Hard
A: 

$x+y=3$

B: 

$x+y=-3$

C: 

\(x-y=3\)

D: 

$x-y=-3$

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