x2 - y2 + 9x - 9y =
(x2 + 9x) - (y2 + 9y) =
x(x + 9) - y(y + 9)
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Another way to go after it:
x2 - y2 + 9x - 9y =
(x2 - y2) + 9x - 9y =
(x + y) (x - y) + 9 (x - y) =
(x + y + 9) (x - y)
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The following is the answer.
6x - 27xy= 3x(2 - 9y)=========
the answer is 9x-29y. if you need help with any kind of math visit www.AAAmath.com
3x-2y+9+9y-x = 2x+7y+9
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