Which equation graphs as a vertical line with an undefined slope? a) y = 3x b) x = 2 3 c) y = 2 3 d) y = − 2 3 x + 1

Step-by-step explanation:

y = a - horizontal line   (a - any real number) - slope = 0

x = a - vertical line   (a - any real number) - undefined slope

y = mx + b - diagonal line (m - any real number except 0, b - any real number) - m - slope

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