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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If you mean y = 2x+5 then the perpendicular slope is -1/2
The slope of the perpendicular is -(1/2) .
If: y = 2/5x+10 then the perpendicular slope is -5/2x or -2.5x
4x+2y = 6 2y = -4x+6 y = -2x+3 Perpendicular slope is 1/2
As for example the perpendicular equation to line y = 2x+6 could be y = -1/2x+6 because the negative reciprocal of 2x is -1/2x