Let's assume x=15. 38x=100×15=1,500. 
. x=39.472 which is rounded to 39%
A . 12 B . 15 C . 36 D .39
2 answers:
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check the picture below.
so, y = -3 is simply a horizontal line, as you see there, and any perpendicular line to that will be a vertical one, whose slope is undefined.
we can check by simply picking two points off the red line hmmm say (-2,2) and (-2, -2)
