The equation for the slope of a line is y=mx+b
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12
The slope is negative 2/3.
Slope of given line = 3 So slope of perpendicular = -1/3
If you mean -x+y = 12 then y = x+12 and so the parallel line will have the same slope but with a different y intercept.
[ y = 12x ] is an equation, not a 'problem'. The graph of that equation is a straight line with a slope of 12 .