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Without an equality sign and not knowing the plus or minus value of 9y it can't be considered to be a straight line equation.

But in general the perpendicular slope is the reciprocal of the slope of the equation. As for example if the slope was 3 then its reciprocal is -1/3.

And if its slope was -3 then its reciprocal would be +1/3

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Q: What is the slope of a line perpendicular to line -2x 9y-8?
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