There is no specific rule.
y = -sqrt(x)
y = x - 12
y = -x/3
y = x2 - 84
are all possible.
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-3 to the 2nd power is -3 x -3 = +9 ( negative x negative = positive)
If X is the variable, then X/(-12+9) = x/(-3) = -X/3
The answer is 1. X=(3)^2 * (3)^-2 X=(3)^2 * 1/(3)^2 X=9 * 1/9 X=9/9 X=1
(-3)x(-3)2 =(-3)(9)=-27
4 x (-3) = (-12)-12 +9 = (-3)so the answer is -3