y = -5x + 9 is the equation of a straight line. It cannot be parallel or perpendicular by itself, you need another line to compare it to.
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It will be any of the equations that has the same slope of y = 5x+9 but with a different y intercept
If X = 9 then 5X would = 5 x 9, which is 45.
39 = 5x + 9 5x = 39 - 9 5x = 30 x = 30 / 5 x = 6
5x+18 = 2x+9 5x-2x = 9-18 3x = -9 x = -3 and y = 3
y = 5x + 9