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( AnSWeR ThE 2 QuEsTioNs)

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                                                Question 1)

The slope between  (-5, -20) and (9, 9) is:

Step-by-step Explanation

Given the points

Finding the slope between (-5, -20) and (9, 9)

Refine

Therefore, the slope between  (-5, -20) and (9, 9) is:

                                        Question 2

the slope between (18, -5) and (18, 20) is undefined.

Step-by-step Explanation

Given the points

As the x-values of the points are the same. It indicates that the given line is vertical.

Finding the slope between (18, -5) and (18, 20)

Slope = m =  [y₂ - y₁] /  [x₂ - x₁]

               =  [20 - (-5)] / [18 - 18]

               = [20+5] / [0]  

               = 25/0

               = ∞ or undefined

Thus, the slope between (18, -5) and (18, 20) is undefined. It indicates that the line is vertical.

Hence, the slope between (18, -5) and (18, 20) is undefined.

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step-by-step explanation: