A parallel slope to 2 is 2. A perpendicular slope to 2 is (-1/2).
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2. Parallel lines have the same slope.
If you mean: -8x+y = 2 then y = 8x+2 and the line parallel to it will have the same slope of 8 but with a different y intercept.
If it's parallel then it has the same slope, so -2/3. The formula for both of these lines is -2/3x + c.
It will have the same slope which is 2
If you mean: 4x-2y = -3 then the slope of the line parallel to it will also have a slope of 2 but with a different y intercept