The slope of y = 9 is infinite (undefined), since the y-value increases infinitely with no change of x.
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If you mean: y = 9-2.5x then the slope is -2.5 and the y intercept is 9
The line perpendicular to a line with a slope of 1/5 has a slope of -5.
The slope of a line is undefined if the line is vertical.
The slope of a line perpendicular to one with slope m is -1/m. So for a line with slope 1/7, any line perpendicular to it will have: slope = -1 / (1/7) = -7
A vertical line has a slope of infinity.