Which of the following lines is perpendicular to \( x+2 y+3=0 \) ?
(a) \( 2 \sqrt{2} x-y+3=0 \)
...
Which of the following lines is perpendicular to \( x+2 y+3=0 \) ?
(a) \( 2 \sqrt{2} x-y+3=0 \)
(b) \( \sqrt{2} x+\sqrt{2} y-5=0 \)
(c) \( 2 \sqrt{2} x-\sqrt{2} y+3=0 \)
(d) \( x+\sqrt{2} y+4=0 \)
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