ZA and ZB are vertical angles. If m_A = (7x– 20)° and m_B = (6x – 1)º,
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check the picture below.
so, y = -3 is simply a horizontal line, as you see there, and any perpendicular line to that will be a vertical one, whose slope is undefined.
we can check by simply picking two points off the red line hmmm say (-2,2) and (-2, -2)
