The dot is 3 lines above the x axis so if you reflect it it would be 3 lines below the x axis so it would be (2,-3)
Hello!
The angle is a right angle, which measures 90°.
3x + x = 4x
Angle = 4x + 10 = 90
Switch that around
90 - 10 = 4x
90 - 10 = 80
80 = 4x
Divide by 4

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Im no genius or sure if its right, but I would definetly go with (12,4)