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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
-7
The line in a fraction means "divided by." 7/9 = 7 divided by 9.
7
The answer is 7! = 7*6*5*4*3*2*1 = 5040