Let $y$ vary directly as $x$. If $y=12$ when $x=4$,then write a linear equation. What is the value of $y$ when $x=5$?
- A$y=3x, y=15$
- B$y=4x, y=20$
- C$y=12x, y=60$
- D$y=x/3, y=5/3$
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