Line CD contains points A (4, 6) and B (4, 3). The slope of line CD is (2 points) positive
undefined
negative
zero

slope is undefined

Step-by-step explanation:

Calculate the slope m using the slope formula

m =

with (x₁, y₁ ) = A(4, 6) and (x₂, y₂ ) = B(4, 3)

m = =

Division by zero is undefined thus the slope of CD is undefined

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