Answer:
x = -5/3
Step-by-step explanation:
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negative reciprocals of each other
9x - 3y = -12
-9x +5y = -1
2y = -13
y = -13/2
-3x - 13/2 = 8/2
-3x = 21/2
-6x = 21
x = -21/6 = -7/2
(-7/2, -13/2)
It has a rotational symmetry of 6
So minimum number of degrees = 360 / 6
= 60 degrees